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STD 11 - 2. structure of atom — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 2. structure of atom4 Marks
MCQ
Which electronic configuration is not observing the ($n + l$) rule
  • A
    $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^1},\,4{s^2}$
  • B
    $1{s^2},\,2{s^2}s{p^6},\,3{s^2}3{p^6}3{d^7},\,4{s^2}$
  • ✓
    $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^5},\,4{s^1}$
  • D
    $1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^8},\,4{s^2}$
✓

Answer

Correct option: C.
$1{s^2},\,2{s^2}2{p^6},\,3{s^2}3{p^6}3{d^5},\,4{s^1}$
c
(c) $3d$ subshell filled with $5$ electrons (half-filled) is more stable than that filled with $4 $ electrons. $1,\,4s$ electrons jumps into $3d$ subshell for more sability.

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