Cr is member of 3d transition series of atomic number 24. What will be its electronic configuration?

Question

Cr is member of 3d transition series of atomic number 24. What will be its electronic configuration? (A)  [Ar]3d6 4s2  (B)  [Ar]3d5 4s2  (C)  [Ar]3d4 4s2  (D)  [Ar] 3d5 4s1

Tardigrade Admin · Accepted Answer

The correct electronic configuration of Cr is [Ar] text 3d5,4s1 and not [Ar] text 3d4,4s2 because exactly half filled and exactly full filled orbitals are more stable than nearly half filled and nearly full filled orbitals.

Q. $C r$ is member of $3 d$ transition series of atomic number $24$ . What will be its electronic configuration?

$[A r] 3 d^{6} 4 s^{2}$

$[A r] 3 d^{5} 4 s^{2}$

$[A r] 3 d^{4} 4 s^{2}$

$[A r] 3 d^{5} 4 s^{1}$

The correct electronic configuration of Cr is $[A r] 3 d^{5}, 4 s^{1}$ and not $[A r] 3 d^{4}, 4 s^{2}$ because exactly half filled and exactly full filled orbitals are more stable than nearly half filled and nearly full filled orbitals.

Q. Cr is member of 3d transition series of atomic number 24. What will be its electronic configuration?

[Ar]3d64s2

[Ar]3d54s2

[Ar]3d44s2

[Ar]3d54s1