Question

Atoms of the same element possessing identical mass but differing in half-life period are called:

• A. nucleids
• B. nuclear isomers
• C. nuclear clones
• D. fissile materials

Answer 1

The correct option is B nuclear isomers

A nuclear isomer is a metastable state of an atomic nucleus caused by the excitation of one or more of its nucleons (protons or neutrons). "Metastable" refers to the fact that these excited states have half-lives more than 100 to 1000 times the half-lives of the excited nuclear states that decay with a "prompt" half life. These atoms of the same element possessing identical mass but differing in half-life period are called Nuclear isomers.