Loss of a beta particle is equivalent to:

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(B) The emission of a beta particle occurs when a neutron in the nucleus decays into a proton and an electron (beta particle). The nuclear reaction is

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Decrease of one neutron only

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(B) The emission of a beta particle occurs when a neutron in the nucleus decays into a proton and an electron (beta particle). The nuclear reaction is represented as: $n 	o p + e^- + \bar{
u}$. As a result,the number of neutrons decreases by $1$ and the number of protons increases by $1$. Therefore,the loss of a beta particle is equivalent to a decrease of one neutron.

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