MCQ
The electronic structure of four elements $A, B, C, D$ are
- A$1{s^2}$
- B$1{s^2},\,\,2{s^2}\,2{p^2}$
- ✓$1{s^2},\,\,2{s^2}\,2{p^5}$
- D$1{s^2},\,\,2{s^2}\,2{p^6}$
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$\mathop {CH_3^ + }\limits_{\rm{I}} $ $\mathop {{H_3}{O^ + }}\limits_{{\rm{II}}} $ $\mathop {N{H_3}}\limits_{{\rm{III}}} $ $\mathop {CH_3^ - }\limits_{{\rm{IV}}} $

