S) The elements with some atomic number but different
mass is called

The elements with the same atomic number but different  mass are called isotopes.

Explanation:

Isotopes are atoms of the same element that differ in the number of neutrons in their nuclei. That is, isotopes are atoms that have the same atomic number - equal numbers of protons - but different atomic mass - different number of neutrons. Their chemical properties, however, do not differ.

answer: a

explanation:

deez noof

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