Q.

Atoms of same element having different mass numbers are Called               .

A. Isobars
B. Isotopes
C. (3)Isotones
D. (4) Isomers
Answer» B. Isotopes
Explanation: Atoms that have the same atomic number but different atomic masses are called isotopes. The difference in mass arises due to the atoms containing a different number of neutrons for the same number of protons. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.
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