Atomic species of the same element that differ in mass are called:
AIsomers
BIsotopes
CIsobars
DIsotones
Answer & Solution
Correct answer: B. Isotopes
1. The three iso- terms are separated by what stays the same.
2. Here the element, and so the proton number, is unchanged.
3. Such atomic species of the same element differing in mass are called isotopes.
4. So the answer is isotopes.
_Source: NCERT Class XII Physics Part II, Ch 13 'Nuclei'_
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