When a substance decays by alpha radiation,the mass number of the nucleus ________ and the atomic number ________.

Name: When a substance decays by alpha radiation,the mass number of the nucleus ________ and the atomic number ________.
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In alpha decay, a nucleus emits an alpha particle, which is a helium nucleus consisting of two protons and two neutrons. Therefore, the mass number of the nucleus reduces by 4 (as it has lost 4 particles), and the atomic number reduces by 2 (as it has lost 2 protons).

When a Substance Decays by Alpha Radiation,the Mass Number of the Nucleus