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Isotopes are atoms of the same element with different numbers of neutrons but the same number of protons. They have identical chemical properties but differ in atomic mass.
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Atomic Mass: The average mass (including all isotopes) for an element listed on the periodic table.
The process by which unstable isotopes spontaneously break down into more stable forms over time.
Half-Life: The time it takes for half of a sample of radioactive isotopes to decay into more stable forms.