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2. structure of atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
Which of the following electronic configurations is not possible
  • A
    $1{s^2}\,\,2{s^2}$
  • B
    $1{s^2}2{s^2}2{p^6}$
  • C
    $3{d^{10}}4{s^2}4{p^2}$
  • ✓
    $1{s^2}2{s^2}\,2{p^2}3{s^1}$
✓

Answer

Correct option: D.
$1{s^2}2{s^2}\,2{p^2}3{s^1}$
d
(d) When $2p$  orbital is completely filled then electron enter in the $3s$. The capacity of $2p$  orbital containing ${e^ - }$is $6$. So $1{s^2},\,2{s^2}2{p^2}3{s^1}$ is a wrong electronic configuration the write is $1{s^2}2{s^2}2{p^3}.$

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