Q12 of 94 Page 440

In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following particles is emitted in the decay?

Atomic number is the number of protons while atomic mass number is the sum of protons and neutrons. The particles emitted will not be proton, electron or neutron since there is no change in the atomic number and mass number. Hence, the emitted particle must be photon.

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