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$Assertion$ (A) Helium and beryllium have similar outer electronic configuration $n s^2$.
$Reason$ (R) Both are chemically inert
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$Reason$ (R) Both are chemically inert
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Verified Answer
The correct answer is:
$A$ is correct but $R$ is incorrect.
The electronic configuration of
$\begin{aligned} \mathrm{He} & =1 s^2 \\ \mathrm{Be} & =1 s^2 2 s^2\end{aligned}$
Both have $n s^2$ configuration but helium is inert because its only shell i.e. $1 s$ is completely filled while Be is a reactive alkaline earth metal. So, A is correct but R is incorrect.
$\begin{aligned} \mathrm{He} & =1 s^2 \\ \mathrm{Be} & =1 s^2 2 s^2\end{aligned}$
Both have $n s^2$ configuration but helium is inert because its only shell i.e. $1 s$ is completely filled while Be is a reactive alkaline earth metal. So, A is correct but R is incorrect.
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