1. What does an unstable nucleus not do to become more stable? Twenty elements, among them gold, fluorine, sodium, aluminum, and phosphorus, have only one stable isotope each. The 80 elements with one or more stable isotopes comprise a total of 252 nuclides that have not been known to decay using
A. The relative abundance of such stable isotopes can be measured experimentally (isotope analysis), yielding an isotope ratio that can be used as a research tool. Stable isotopes do not undergo radioactive decay. The most common types of radiation are called alpha, beta, and Are isotopes unstable? Dubnium does not occur naturally on Earth and is produced artificially. Below is alphabetical isotope list of enriched isotopes (Stable isotopes and Radioisotopes) by name of the chemical element: It is possible to click on each isotope (or chemical name) to see a list of possible applications and isotope parameters and extra information. The so-called stable isotopes are nuclei that do not appear to decay to other isotopes on geologic timescales, but may themselves be produced by the decay of radioactive isotopes. More than 1,000 radioactive isotopes of Why do unstable atoms decay? P is stable and is therefore present at 100% abundance. Here, Carbon-12 is a stable isotope whereas carbon-14 is mostly a radioactive isotope. Hydrogen-4 is a highly unstable isotope of hydrogen. Solid xenon belongs to the face-centred cubic crystal system, which implies that its molecules, which consist of single Carbon (Z=6) has two stable isotopes C =98.89% , C=1.11%. It is incorporated in laboratories bombarding tritium with fast-moving deuterium nuclei. There are important exceptions to this rule microemulsions are thermodynamically stable, while translucent nanoemulsions are kinetically stable. The term stable isotope has a meaning similar to stable nuclide, but is preferably used when speaking of nuclides of a specific element.Hence, the plural form stable isotopes usually refers to isotopes of the same element. Carbon-12 has 6 neutrons, carbon-13 has 7 neutrons, and carbon-14 contains 8 neutrons. Theory or location on the chart of Nucleids may predict this to be an unstable isotope but the half life-life is either non-existent (stable isotope) or is too long to measure. Consider the example of 210Po decaying by the emission of an alpha particle. Copper (29 Cu) has two stable isotopes, 63 Cu and 65 Cu, along with 27 radioisotopes. There are 254 known stable isotopes. Therefore, the atomic masses of isotopes are different from each other. For example, 14 C, a radioisotope of carbon, is produced in the atmosphere by the interaction of cosmic-ray neutrons with stable 14 N. With a half-life of 5,730 yr, 14 C decays back to 14 N by emission of a beta particle. There is usually one dominant stable isotope. When an isotope is unstable it releases penetrating rays and particles to gain stability What are these rays and particles referred to as? What happens to an isotope that is unstable? The An isolated neutron is unstable and will decay with a half-life of 10.5 minutes. When a certain isotope decays it emits photons what kind of decay is happening? You may be familiar with the element uranium - it has several unstable isotopes, U-235 being one of the most commonly known. When it decays, it forms protactinium-234. An atom is first identified and labeled according to the number of protons in its It was the first noble gas found to form true chemical compounds. Its atomic mass is 4.02781 0.00011. The 80 elements with one or more stable isotopes comprise a total of 252 nuclides that have not been known to decay using Polonium is a chalcogen.A rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth.Due to the short half-life of all its How can you tell if an isotope is unstable? Each isotope, stable or unstable, has a specific symbol; for example K-40 for potassium 40.
Every chemical element has one or more radioactive isotopes. One of the least stable isotopes of hydrogen is 7 H and the most stable isotope is 5 H. The most stable radioisotope of hydrogen is tritium. After 24 hours, the radioactivity from the procedure will be reduced by more than 90%.
Protons and neutrons, each with masses of approximately one atomic mass unit, are jointly referred to as "nucleons" (particles present Aside from stable lutetium, its radioactive isotopes have several specific uses. Stable isotope techniques are extremely useful in resolving trophic pathways by which contaminants become bioavailable, bioaccumulate, and biomagnify. It is a metal that belongs to the first transition series and group 8 of the periodic table.It is, by mass, the most common element on Earth, right in front of oxygen (32.1% and 30.1%, respectively), forming much of Earth's outer and inner core.It is the fourth most common A neutron in a nucleus will decay if a more stable nucleus Play Sound ./. For example, a phase of a (an equilibrium fractionation), the heavier water isotopes (18 O and 2 H) become enriched in the liquid phase while the lighter isotopes (16 O and 1 H) have identical free energies and therefore are equally likely to exist. Different isotopes may have different properties - for example one might be stable and another might be unstable, and gradually undergo radioactive decay to become another element. In condensed matter physics, a BoseEinstein condensate (BEC) is a state of matter that is typically formed when a gas of bosons at very low densities is cooled to temperatures very close to absolute zero (273.15 C or 459.67 F). The neutron/proton ratio and the total number of nucleons determine isotope stability. For full treatment, see isotope: Radioactive isotopes.
Novel stable isotope tracer methodologies have been extensively developed over the past 80 years, and it is now possible to accurately measure changes in protein metabolism from the whole body down to a tissuespecific level and even individual protein level with relative There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Technetium and promethium (atomic numbers 43 and 61, respectively) and all the elements Many more isotopes have been produced in nuclear reactors and scientific laboratories. electrons, bond between two nitrogen atoms. It is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 28 hours. Isotopes usually aren't very stable, and they tend to undergo radioactive decay until something that is more stable is formed. The short half-life of technetium-99m helps keep the dose to the patient low. The 83rd element, bismuth, was traditionally regarded as having the heaviest stable isotope, bismuth-209, but in 2003 researchers in Orsay, France, measured the half-life of 209 Bi to be 1.9 10 19 years. Therefore, the atomic masses of isotopes are different from each other. After 24 hours, the radioactivity from the procedure will be reduced by more than 90%. What atom is unstable and emits radiation? Explore the latest full-text research PDFs, articles, conference papers, preprints and more on STABLE ISOTOPES. Nature Education Knowledge 3 (12) :3.
First of all, we need to outline what stable isotopes are relative to the unstable ones. Then play a game to test your ideas! Key Areas Covered. There are important exceptions to this rule microemulsions are thermodynamically stable, while translucent nanoemulsions are kinetically stable. The heavier elements usually decay by alpha emission. The main difference between a stable atom and an unstable isotope is its _____, and whether or not it is radioactive. Atom - The smallest particle of any element that still retains the characteristics of that element. Usually through experiments, one can determine a lower limit for the half-life. Copper (29 Cu) has two stable isotopes, 63 Cu and 65 Cu, along with 27 radioisotopes.
The product of the decay is called the daughter isotope .
Nice work! xenon (Xe), chemical element, a heavy and extremely rare gas of Group 18 (noble gases) of the periodic table. Stable isotopes have the same number of protons and neutrons. Under such conditions, a large fraction of bosons occupy the lowest quantum state, at which point microscopic quantum mechanical 5. Polonium is a chemical element with the symbol Po and atomic number 84. Why do some isotopes decay? Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation. For example carbon, carbon-12 is stable and has six protons and six neutrons. The stable elements at the end of the decay series all have a magic number of neutrons or protons. It is a silvery white metal, which resists corrosion in dry air, but not in moist air.Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths.Lutetium is generally considered the first element of the 6th-period transition metals by those who study the matter, All matter such as solids, liquids, and gases, is composed of atoms. An example of this is seen in the separation of the oil and vinegar components of vinaigrette, an unstable emulsion that will quickly separate unless shaken almost continuously. 2. What is released in beta plus decay? Every chemical element has one or more isotopes. Advertisement. For example, hydrogen, the lightest element, has three isotopes with mass numbers 1, 2, and 3.
Under such conditions, a large fraction of bosons occupy the lowest quantum state, at which point microscopic quantum mechanical They are protium, deuterium, and tritium. Many nuclei in nature are very stable, most of the nuclei formed at the creation of the universe or after supernovae explosions many millions of years ago are still in existence now. Stable nuclides are nuclides that are not radioactive and so (unlike radionuclides) do not spontaneously undergo radioactive decay.When such nuclides are referred to in relation to specific elements, they are usually termed stable isotopes.. For example, technetium-99m, one of the most common medical isotopes used for imaging studies, has a half-life of 6 hours. For each of the 80 stable elements, the number of the stable isotopes is given. It is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 28 hours. A stable atom is an atom that has enough binding energy to hold the nucleus together permanently. What is the parent isotope in an equation? The word nuclide was coined by Truman P. Kohman in 1947. Kohman defined nuclide as a "species of atom characterized by the constitution of its nucleus" containing a certain number The nuclei He-4, O-16, and Pb-208 (82 protons and 126 neutrons) that contain magic numbers of both neutrons and protons are particularly stable.
Stable isotopes are elements with the same number of protons but different number of neutrons. The For example, 14 C, a radioisotope of carbon, is produced in the atmosphere by the interaction cosmic-ray neutrons with stable 14 N. It was the first noble gas found to form true chemical compounds.
and neutrons. All elements have isotopes. Isotopes utilized in nuclear medicine fall into two broad categories: Stable and Unstable. How is the unstable carbon created? Stable and Unstable Isotopes.
Which is the characteristics of unstable nucleus? and and an unstable atom. Carbon exists in several isotopes. A stable isotope does NOT undergo radioactive (or nuclear) decay.. An unstable isotope undergoes radioactive (or nuclear) decay. Where X denotes the element, H is the mass of the heavy isotope, R is the ratio of the heavy to light isotope for X. There are 254 known stable isotopes. Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability. It is a metal that belongs to the first transition series and group 8 of the periodic table.It is, by mass, the most common element on Earth, right in front of oxygen (32.1% and 30.1%, respectively), forming much of Earth's outer and inner core.It is the fourth most common Cont The C/C ratios of about 90:1 is roughly constant in all natural materials. Then play a game to test your ideas! The word nuclide was coined by Truman P. Kohman in 1947. Examples of stable elements used in nuclear medicine isotopes such as carbon-13, nitrogen-15 and oxygen-18 as well as noble gas isotopes.
For example, unstable 14 C transforms to stable nitrogen (14 N). What does an unstable nucleus absorb? List of stable isotopes Edit Edit source History Talk (0) watch 01:54. Categories Categories: Add category; Cancel Save. What is the difference between carbon-12 and carbon-14? But thorium-234 is also radioactive. The hydrogen nucleus contains just one proton. For example, ""_92^238"U" _90^234"Th" + _2^4"He" BETA PARTICLES A beta All these isotopes have the same number of protons in their nucleus, one proton. For example, the half-life of carbon-14 is 5730 years.
This is the main difference between stable and unstable isotopes. The most stable radioisotope is 67 Cu with a half-life of 61.83 hours, while the least stable is 54 Cu with a half-life of approximately 75 ns. Why do atoms want to be stable? The most stable radioisotope is 67 Cu with a half-life of 61.83 hours, while the least stable is 54 Cu with a half-life of approximately 75 ns. Unstable isotopes have an uneven number of protons and neutrons. An isotope is one of two or more species of atoms of a chemical element with the same atomic number. You may be familiar with the element uranium - it has several unstable isotopes, U-235 being one of the most commonly known. Polonium is a chemical element with the symbol Po and atomic number 84. Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation.A material containing unstable nuclei is considered radioactive.Three of the most common types of decay are alpha decay (-decay), beta decay (-decay), and gamma decay ( Isotopes can either be stable or unstable. Different isotopes may have different properties - for example one might be stable and another might be unstable, and gradually undergo radioactive decay to become another element. The graph below is a plot of neutron number against proton number. Technetium and promethium (atomic numbers 43 and 61, respectively) and all the elements The numbers 12, 13, and 14 are the isotopes atomic masses. Another example of an element with numerous isotopes is strontium. For example, tin has 10 such stable isotopes. The balance of protons. Every chemical element has one or more isotopes. Which is an example of parent isotope? Unstable isotopes are also known as radioisotopes or radionucleides This greatly limits extended research on the element. Most elements on the periodic table have at least two stable isotopes. All artificial (lab-made) isotopes are unstable and therefore radioactive; scientists call them radioisotopes. Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Most have half-lives under a minute.
In order to become stable, these unstable isotopes undergo radioactive decay. A nuclide (or nucleide, from nucleus, also known as nuclear species) is a class of atoms characterized by their number of protons, Z, their number of neutrons, N, and their nuclear energy state.. One of the least stable isotopes of hydrogen is 7 H and the most stable isotope is 5 H. The most stable radioisotope of hydrogen is tritium. An example is the stability of the closed shell of 50 protons, which allows tin to have 10 stable isotopes, more than any other element. Every chemical element has one or more radioactive isotopes. An example is the stability of the closed shell of 50 protons, which allows tin to have 10 stable isotopes, more than any other element. For example, technetium-99m, one of the most common medical isotopes used for imaging studies, has a half-life of 6 hours. in a nucleus. An example of this is seen in the separation of the oil and vinegar components of vinaigrette, an unstable emulsion that will quickly separate unless shaken almost continuously. Only hydrogen-3 (tritium), however, is a radioactive isotope, the other two being stable. Stable nuclides are nuclides that are not radioactive and so (unlike radionuclides) do not spontaneously undergo radioactive decay.When such nuclides are referred to in relation to specific elements, they are usually termed stable isotopes.. A proton is a stable subatomic particle, symbol p, H +, or 1 H + with a positive electric charge of +1e elementary charge.Its mass is slightly less than that of a neutron and the proton-to-electron mass ratio makes it 1836 times the mass of an electron.
For example, carbon is commonly found with three configurations of protons and neutrons, called isotopes. While most (82.58%) strontium atoms have 50 neutrons, others have anywhere from 44 to 52 neutrons, yet they are still strontium because they have 38 protons. The principal factor is the neutron to proton ratio. For full treatment, see isotope: Radioactive isotopes. Isotope definition, any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. Dubnium does not occur naturally on Earth and is produced artificially. What makes an isotope more stable? Protein Turnover in Mammals: An Example of the Application of Stable Isotope Tracers. Hydrogen has four additional isotopes (4 H through 7 H) that are manmade and highly unstable. Most isotopes become stable by emitting alpha particles, beta particles, positrons, or gamma rays. Radioactive (unstable) isotopes have nuclei that spontaneously decay over time to form other isotopes. While most (82.58%) strontium atoms have 50 neutrons, others have anywhere from 44 to 52 neutrons, yet they are still strontium because they have 38 protons. Its isotope deuterium, or heavy hydrogen, contains a proton and a neutron. Do you like this video? The short half-life of technetium-99m helps keep the dose to the patient low. As an example, the parent isotope of one radioactive family is uranium-238. Unstable copper isotopes with atomic masses below 63 tend to undergo + decay, while isotopes with atomic masses What is stable and unstable elements? Hydrogen-4 is a highly unstable isotope of hydrogen. A nuclide (or nucleide, from nucleus, also known as nuclear species) is a class of atoms characterized by their number of protons, Z, their number of neutrons, N, and their nuclear energy state.. Obi-Wan Finale - The Loop. Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation.A material containing unstable nuclei is considered radioactive.Three of the most common types of decay are alpha decay (-decay), beta decay (-decay), and gamma decay ( Is phosphorus stable or unstable? Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. Another example of an element with numerous isotopes is strontium. More than 4.5 times heavier than air, xenon is colourless, odourless, and tasteless. The atomic nucleus that decays is called the parent isotope . Stable and Unstable Isotopes Elements can be made up of different isotopes.
isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. Unstable copper isotopes with atomic masses below 63 tend to undergo + decay, while isotopes with atomic masses The objectives of this project are to: Utilize stable isotopes to better resolve the geochemical cycling of contaminants that influences bioavailability. There are two main types of isotopes: stable and unstable (radioactive).
Why are heavy elements unstable? What makes an isotope not stable?
For example, hydrogen, the lightest element, has three isotopes with mass numbers 1, 2, and 3. When uranium-238 decays, it forms thorium-234. Lutetium is a chemical element with the symbol Lu and atomic number 71. Some elements can only exist in an unstable form (for example, uranium). Iron (/ a r n /) is a chemical element with symbol Fe (from Latin: ferrum) and atomic number 26. For example, carbon is commonly found with three configurations of protons and neutrons, called isotopes. Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Unstable Atom - The nuclei of some atoms where the binding energy is not strong enough to hold the nucleus together. The C-13 and S-34 of coexisting carbonates and sulfides can be used to determine the pH and oxygen fugacity of the ore Stable and Unstable Nuclei | Radioactivity | Physics | FuseSchoolHow do you know if an atom is stable? Because the nucleus experiences the intense conflict between the two strongest forces in nature, it should not be surprising that there are many nuclear isotopes which are unstable and emit some kind of radiation. Stable isotopes have helped uncover migratory routes, trophic levels, and the geographic origin of migratory The differences between minerals can be used to estimate the temperature of equilibration. It is incorporated in laboratories bombarding tritium with fast-moving deuterium nuclei. Consider the example of 210Po decaying by the emission of an alpha particle. A uniform scale of nuclear stability, one that applies to stable and unstable isotopes alike, is based on a comparison of measured isotope masses with the masses of their constituent electrons, protons, and neutrons. The hydrogen nucleus contains just one proton. Community content is available under CC-BY-SA unless otherwise noted. What types of isotopes are unstable? Isotopes can be divided mainly into two groups as stable isotopes and unstable isotopes. . The relative abundance of such stable isotopes can be measured experimentally (isotope analysis), yielding an isotope ratio that can be used as a research tool. A few become stable by electron capture or by spontaneous fission. Carbon-12 and 13 are stable isotopes, which means that the nucleus does not undergo radioactive decay. What does k40 decay into? Thus, 252 isotopes (nuclides) are stable by definition (including tantalum-180m, for which no decay has yet been observed). There are two main types of isotopes: stable and unstable (radioactive). What does stable mean in physics? Protons and neutrons, each with masses of approximately one atomic mass unit, are jointly referred to as "nucleons" (particles present All elements have isotopes. There are 80 elements with at least one stable isotope, but 114 to 118 chemical elements are known. Lutetium metal is slightly unstable in air at standard conditions, but it burns readily at 150 C to form lutetium oxide. More than 1,000 radioactive isotopes of Examples include _____ . Isotopes are atoms with the same number of protons and electrons, but a different number of neutrons. Kohman defined nuclide as a "species of atom characterized by the constitution of its nucleus" containing a certain number Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. The most common types of radiation are called alpha, beta, and The main difference between stable and unstable isotopes is that stable isotopes have stable nuclei whereas unstable isotopes have unstable nuclei. Isotope definition, any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. On the other hand, a few elements for example, technetium have no stable isotopes. A stable isotope does not decay naturally. For example, unstable 14 C transforms to stable nitrogen (14 N). Thus, the ratio of 13 C: 12 C is expressed as 13 C and 15 N: 14 N becomes 15 N. A sample, which has more of the heavier isotope in relation to the standard, is commonly referred to as being enriched, and one with proportionally less of the heavy isotope For example, 12C accounts for the vast majority of carbon (98.89%) where as 13C accounts for very little (1.11%). Is potassium stable or unstable? Most have half-lives under a minute. A neutron in a nucleus will decay if a more stable nucleus The 83rd element, bismuth, was traditionally regarded as having the heaviest stable isotope, bismuth-209, but in 2003 researchers in Orsay, France, measured the half-life of 209 Bi to be 1.9 10 19 years. Why do some atoms decay? The graphic below charts the time it takes for the longest-lived isotope a form having the same number of protons but a different number of neutrons of each of the unstable elements to decay. The atomic nucleus that decays is called the parent isotope .
An atom is first identified and labeled according to the number of protons in its For example, in addition to C12, a typical sample of carbon contains 1.11% C136, with 7 neutrons and 6 protons, and a trace of C146, with 8 neutrons and 6 protons. Stable nuclides are nuclides that are not radioactive and so (unlike radionuclides) do not spontaneously undergo radioactive decay.When such nuclides are referred to in relation to specific elements, they are usually termed stable isotopes.. Isotopes usually aren't very stable, and they tend to undergo radioactive decay until something that is more stable is formed. Find methods information, sources, references or The 80 elements with one or more stable isotopes comprise a total of 252 nuclides that have not been known to decay using Of the first 82 elements in the periodic table, 80 have isotopes considered to be stable. Usually, what makes an isotope unstable is the large nucleus. Is carbon stable or unstable? 1. For this purpose, electrons and protons are paired together as hydrogen atoms. Unstable isotopes like 235U and 238U breakdown over time. . Key Areas Covered. Only hydrogen-3 (tritium), however, is a radioactive isotope, the other two being stable. Radioactive (unstable) isotopes are nuclides Lithogenic (metals and semi-metals) isotopes The sample size is dependent on the species being analyzed. This is important because the isotope geochemist needs to understand the nature of the measurements in order to realize the character and limitations of the data. When sulfide minerals are precipitated, isotopic equilibration among solids and liquid may cause small differences in the S-34 values of co-genetic minerals. Stable and unstable nuclei The nucleus of all atoms (with the exception of hydrogen) contains one or more protons and one or more neutrons. When nucleons form a stable nucleus binding energy is? Hydrogen has four additional isotopes (4 H through 7 H) that are manmade and highly unstable. ALPHA PARTICLES An alpha particle is a helium nucleus. Radioactive, or unstable, isotopes release energy as they decay. When an electron is emitted by an unstable nucleus The atomic number is? For example, a phase of a (an equilibrium fractionation), the heavier water isotopes (18 O and 2 H) become enriched in the liquid phase while the lighter isotopes (16 O and 1 H) have identical free energies and therefore are equally likely to exist. xenon (Xe), chemical element, a heavy and extremely rare gas of Group 18 (noble gases) of the periodic table. The main difference between stable and unstable isotopes is that stable isotopes have stable nuclei whereas unstable isotopes have unstable nuclei. Isotopes can be divided mainly into two groups as stable isotopes and unstable isotopes. Some elements can only exist in an unstable form (for example, uranium). For example, helium-4 is among the most abundant (and stable) nuclei in the universe. Many more isotopes have been produced in nuclear reactors and scientific laboratories. The product of the decay is called the daughter isotope . Carbon-14 possesses an unstable nucleus which undergoes radioactive decay. All artificial (lab-made) isotopes are unstable and therefore radioactive; scientists call them radioisotopes. We will first learn about how stable (and sometimes unstable) isotope ratios are measured by mass spectrometry. The nucleus of isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. Solid xenon belongs to the face-centred cubic crystal system, which implies that its molecules, which consist of single
Isotopes can be classified as either: natural (found in nature) man made (artificial or synthetic) Isotopes can also be classified as stable or unstable: . The term stable isotope has a meaning similar to stable nuclide, but is preferably used when speaking of nuclides of a specific element.Hence, the plural form stable isotopes usually refers to isotopes of the same element. Iron (/ a r n /) is a chemical element with symbol Fe (from Latin: ferrum) and atomic number 26. This greatly limits extended research on the element. The An isolated neutron is unstable and will decay with a half-life of 10.5 minutes. In addition, it is found as native element in the form of graphite and diamond. determines whether a nucleus will be stable or unstable. How are unstable isotopes formed? Carbon exists as two stable isotopes: 12 C, which has six electrons, six protons, and six neutrons, and 13 C, which has six electrons, six protons, and seven neutrons.