Question

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Answer 1

Explanation:

ANSWER

A. Elements with same atomic number but different mass number are called isotopes.

B. Elements with same number of electrons but different number of neutrons are called isotopes.

C. Elements with same number of neutrons but different number of electrons are called isotones.

D. If the Sum of the number of protons and neutrons (is equal to mass number of an atom) is same but the number of protons is different the atoms are called isobars.