Different versions of the same element that have the same number of protons but different numbers of neutrons.: ISOTOPES, The fraction or percentage of an isotope found in nature, usually written as a decimal.: RELATIVE ABUNDANCE, The weighted average mass of all the isotopes of an element.: ATOMIC MASS, A mathematical symbol (∑) that means “add them all together.”: SUMMATION(∑), The mass of a specific isotope of an element.: ISOTOPE MASS,

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