A) \[{{\beta }^{-}}\]-emission
B) \[\alpha \]-emission
C) \[{{\beta }^{+}}\]-emission
D) K-electron capture
Correct Answer: A
Solution :
[a] In stable isotope of \[Na,\] there are 11 protons and 12 neutrons. In the given radioactive isotope of sodium \[(N{{a}^{24}}),\] there are 13 neutrons, one neutron is more than that required for stability. A neutron rich isotope always decay by \[{{\beta }^{-}}\text{-}\]emission as \[{{{}_{0}}^{{{n}^{1}}}}\xrightarrow{{}}{}_{-1}{{\beta }^{0}}+{}_{1}{{H}^{1}}\]
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