1. Tardigrade
  2. Question
  3. Chemistry
  4. During the emission of a positron from a nucleus, the mass number of the daughter element remains the same but the atomic number

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Q. During the emission of a positron from a nucleus, the mass number of the daughter element remains the same but the atomic number

WBJEEWBJEE 2014

Solution:

When a positron is emitted, a proton is converted into neutron and neutrino. Thus, the number of protons and hence the atomic number decreases by one unit.
$\underset{\text{Proton}}{{ }_{1}^{1} H} \longrightarrow \underset{\text{Neutron}}{{ }_{0}^{1} n}+ \underset{\text{Positron}}{{ }_{+1} e^{0}}+ \underset{\text{Neutrino}}{v}$