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What differentiates the isotopes of an element?

A) Number of protons
B) Number of neutrons
C) Number of electrons
D) Atomic Number

2 Answers

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An isotope is different from an element by the number of neutrons it has. 
User Rincewind
by
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Isotopes of an elements have same number of electrons and protons
They differ only in number of neutrons
so correct option is neutrons that is B
hope it helps
User Jatin Sanghvi
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