Answer:
(a) (σ2s)² (σ2*s)² (π2p)⁴ (σ2p)²
(b) (σ2s)² (σ2*s)² (π2p)⁴ (σ2p) (π*2p)
Explanation:
An N atom has five valence electrons, so a molecule of N₂ has 10 valence electrons.
Use the Aufbau Principle to place 10 electrons in the MO diagram for B, C, and N.
1.Ground state
The valence electron configuration of N₂ is
(σ2s)² (σ2*s)² (π2p)⁴ (σ2p)²
2. First excited state
One of the σ2p electrons is promoted to the next higher level, π*2p.
The valence electron configuration becomes
(σ2s)² (σ2*s)² (π2p)⁴ (σ2p) (π*2p)
