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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
The electronic configuration of chromium is
  • A
    $[Ne]3{s^2}3{p^6}3{d^4},4{s^2}$
  • ✓
    $[Ne]3{s^2}3{p^6}3{d^5},4{s^1}$
  • C
    $[Ne]3{s^2}3{p^6},4{s^2}4{p^4}$
  • D
    $[Ne]3{s^2}3{p^6}3{d^1},4{s^2}4{p^3}$
✓

Answer

Correct option: B.
$[Ne]3{s^2}3{p^6}3{d^5},4{s^1}$
b
(b) $3d$  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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