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5 votes
An isotope of an element has:

more protons
less protons
a different atomic mass
the same number of neutrons

User Qwe Asd
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1 Answer

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All isotopes of a given atom have the same amount of protons: the first two answers are false. They differ in the number of neutrons, so the last answer is also false.

The correct answer is: a different atomic mass
User Ramon
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