Question

Assertion
The free gaseous Cr atom has six unpaired electrons.
Reason
Half-filled s-orbital has greater stability.

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Answer 1

The free gaseous Cr atom has six unpaired electrons due to following electronic configuration (atomic number = 24)
$=\left[Ar\right]3d^{5}4s^1$
This is because half-filled d-orbital is more stable as compared to incompletely filled d-orbital.

So, one electron jumps from $4s$ orbital to $3d$ orbital
Hence, option C is correct.