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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
The correct ground state electronic configuration of chromium atom is
  • ✓
    $[Ar]\,3{d^5}\,4{s^1}$
  • B
    $[Ar]\,3{d^4}4{s^2}$
  • C
    $[AR]3{d^6}4{s^0}$
  • D
    $[Ar]4{d^5}4{s^1}$
✓

Answer

Correct option: A.
$[Ar]\,3{d^5}\,4{s^1}$
a
(a) $ 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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