MCQ
In the $n^{th}$ quantum level, the number of electronic subshell is
- ✓$n$
- B$2n^2$
- C$2n$
- D$2 \times (2l + 1)$
No. of substell $=n$
Eg for $n=2$
No of Subshell $=2$ which are $2s$ and $2 p$
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$O(g) + e^- = O^-(g)$ $\Delta {H_{eg}} = - 142\,kJ\,mo{l^{ - 1}}$
$O^-(g) + e^- = O^{2-}(g)$ $\Delta {H_{eg}} = +844\,kJ\,mo{l^{ - 1}}$
This is because

Product $(A)$ of the above reaction is
$^{200}X \,:\, 90\%$ $^{199}X\, :\, 8.0\%$ $^{202}X\, :\, 2.0\%$
The weighted average atomic mass of the naturally occurring element $X$ is closest to......$amu$