how do the mass number and the atomic number of a nucleus change when it emits i) an alpha ii) a beta particle
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Alpha particles consist of two protons and two neutrons . ... When a nucleus emits an alpha particle, these changes happen: the mass number decreases by 4. the atomic number decreases by 2.
Explanation:
For a nucleus to emit an electron, a neutron must change into a proton and an electron. Therefore, the nucleus has gained +1 in Z but has not gained in mass number. Therefore the atomic number Z increases by 1 and the mass number A is unchanged.
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