Gamma Emission Changes Neither Mass Nor Atomic Number
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State
Gamma emission releases a high-energy photon as an excited nucleus relaxes to a lower energy state, changing neither mass number nor atomic number.
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Cobalt-60 emits gamma radiation as its excited nucleus settles to its ground state, remaining cobalt-60 throughout.
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Gamma emission alone never transmutes one element into another — it often accompanies alpha or beta decay, but alone changes only energy state.