What is the term for a version of an element that has slightly different atomic masses but similar chemical properties?

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Multiple Choice

What is the term for a version of an element that has slightly different atomic masses but similar chemical properties?

Explanation:
Isotopes are versions of an element that have the same number of protons but different numbers of neutrons, so their atomic masses differ while their chemical properties remain similar because chemical behavior is governed mainly by electrons, which are arranged by the proton count. For example, carbon-12 and carbon-14 are both carbon atoms with six protons, but carbon-12 has six neutrons while carbon-14 has eight; they react in the same ways because their electron configurations are the same, even though one is heavier. An element is defined by its number of protons, an atom is the basic unit of an element, and the nucleus is the dense center containing protons and neutrons.

Isotopes are versions of an element that have the same number of protons but different numbers of neutrons, so their atomic masses differ while their chemical properties remain similar because chemical behavior is governed mainly by electrons, which are arranged by the proton count. For example, carbon-12 and carbon-14 are both carbon atoms with six protons, but carbon-12 has six neutrons while carbon-14 has eight; they react in the same ways because their electron configurations are the same, even though one is heavier. An element is defined by its number of protons, an atom is the basic unit of an element, and the nucleus is the dense center containing protons and neutrons.

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