Question

Why chain isomersm is called muclear isomerism?

Answer 1

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Metastable isomers. Metastableisomers can be produced throughnuclear fusion or other nuclearreactions. A nucleus produced this way generally starts its existence in an excited state that relaxes through the emission of one or more gamma rays or conversion electrons.
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Answer 2

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Nuclear isomers are atoms with the same mass number and atomic number, but with different states of excitation in the atomic nucleus. The higher or more excited state is called a metastable state, while the stable, unexcited state is called the ground state.