A) is decreased by 1 unit
B) is decreased by 2 units
C) is increased by 1 unit
D) remains unchanged
Correct Answer: A
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. \[\underset{\text{Proton}}{\mathop{_{\text{1}}^{\text{1}}\text{H}}}\,\xrightarrow{{}}\underset{\text{Neutron}}{\mathop{_{\text{0}}^{\text{1}}\text{n}}}\,\text{+}\,\underset{\text{Positron}}{\mathop{_{\text{+}}{{\text{1}}^{\text{0}}}}}\,\text{+}\underset{\text{Neutrino}}{\mathop{\text{v}}}\,\]
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