Which of the following nuclides is positron emitter ?

$H^{3}$

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$H^{e^{6}}$

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$B^{12}$

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$N^{13}$

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Solution

The correct option is D
$N^{13}$

$\frac{n}{p} (= \frac{6}{7}) f o r N^{13}$ is too small.

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_67^{165} Ho

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Which of the following nuclides is the least stable ?

_{11}^{23} N a

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