Question

Nuclear isomerism in chemistry explain with example

Answer 1

 nuclear isomer is a metastable state of an atomic nucleus caused by theexcitation of one or more of its nucleons (protons or neutrons). "Metastable" describes nuclei whose excited states have half-lives 100 to 1000 times longer than the half-lives of the excited nuclear states that decay with a "prompt" half life (ordinarily on the order of 10−12 seconds). The term "metastable" is usually restricted to isomers with half-lives of 10−9 seconds or longer. Some references recommend 5 × 10−9 seconds to distinguish the metastable half life from the normal "prompt" gamma emission half life.[1] Occasionally the half-lives are far longer than this and can last minutes, hours, or years. For example the 180m
73Ta
 nuclear isomer survives so long that it has never been observed to decay (at least 1015years).

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