Isotopes and Radioactive Decay
The mass number of an atom is simply the total number of its protons and neutrons. All atoms of particular element have the same number of protons, but they may have varying numbers of neutrons. Atoms with the same number of protons but different numbers of neutrons are isotopes of that element. Isotopes of the same element are labeled by placing the mass number after the element's name or symbol. For example, carbon has three well-known isotopes. One has a mass number of 12(carbon-12), another has a mass number of 13(carbon-13), and the third, carbon-14, has a mass number of 14. Carbon 12 must also have six neutrons to give it a mass number of 12. Carbon-14, on the other hand, has six protons plus eight neutrons to give it a mass number of l4.
Isotopes and Radioactive Decay The mass number of an atom is simply the total number of its protons and neutrons. All atoms of particular element have the same number of protons, but they may have varying numbers of neutrons. Atoms with the same number of protons but different numbers of neutrons are isotopes of that element. Isotopes of the same element are labeled by placing the mass number after the element's name or symbol. For example, carbon has three well-known isotopes. One has a mass number of 12(carbon-12), another has a mass number of 13(carbon-13), and the third, carbon-14, has a mass number of 14. Carbon 12 must also have six neutrons to give it a mass number of 12. Carbon-14, on the other hand, has six protons plus eight neutrons to give it a mass number of l4.
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