What happens when a gamma ray is emitted from nucleus of an atom

The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable). Gamma ray emission frequently follows beta decay, alpha decay, and other nuclear

Explanation:

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oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).