In order to satisfy charge conservation and lepton number conservation the other products must be neutron.
The principle of conservation of mass states that, the sum of the initial mass of reactants must be equal to final mass of the products.
[tex]_{15}^{30}P\ --- > \ _{14}^{30} Si \ + \ ^{0}_{1} n[/tex]
The balanced reaction of radioactive decay of phosphorous shows conservation of mass.
Thus, in order to satisfy charge conservation and lepton number conservation the other products must be neutron.
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