The type of radioactive decay does not cause change in the atomic mass of the product is beta decay.
What is radioactive decay?
Radioactive decay is a type of nuclear decay in which unstable nuclei of radioactive decay losses its energy in the form of radiations to gets the stable state.
Beta decay is also of two types which are minus beta decay and plus beta decay and in both decays, atomic mass of the parent atom doen not changes but changes in the atomic number takes place. As in this deacy a neutron is convert into an electron and proton.
Hence beta decay does not cause change in the atomic number.
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