alleryElectron configuration of carbon (Z = 6):
A1s² 2s² 2p⁶
B1s² 2s² 2p²
C1s² 2s² 2p² 3s²
D2s² 2p⁴
Answer & Solution
Correct answer: B. 1s² 2s² 2p²
**Filling order:** 1s, 2s, 2p.
**Carbon has 6 electrons:** 1s² 2s² 2p².
The 2p² has 2 unpaired e⁻ in different p orbitals (Hund's rule).
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