The isotopes of an element differ in

(A) the number of neutrons in the nucleus 

(B) the charge on the nucleus 

(C) the number of extra-nuclear electrons 

(D) both the nuclear charge and the number of extra-nuclear electrons

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2 Answers

Correct Option is : (A) the number of neutrons in the nucleus

Isotopes elements have same number of protons but differ in number of neutrons.

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Option : (A) the number of neutrons in the nucleus

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