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QUESTION

# What is an electron configuration of a nitrogen molecule?

The of "N"_2 is (σ1s)^2(σ^"∗"1s)^2(σ2s)^2(σ^"∗"2s)^2(π2p_x)^2(π2p_y)^2(σ2p_z)^2

The molecular orbitals of "N"_2 are formed by overlapping the atomic orbitals of the "N" atoms.

The new molecular orbitals are formed as follows:

• The 1s orbitals form a σ1s and an antibonding σ"*"1s MO.
• The 2s orbitals form a bonding σ2s and an antibonding σ"*"2s MO.
• The 2p orbitals directed along the internuclear axis form a bonding σ2p_z and an antibonding σ"*"2p_z MO.
• The 2p_x and 2p_y orbitals from each atom form bonding π2p_x and π2p_y bonding MOs and antibonding π"*"2p_x and π"*"2p_y MO.

The relative energy levels of the orbitals are

Each "N" atom contributes seven electrons, so we use the Aufbau Principle to fill the MOs starting at the lowest level.

The result is

Thus, the electron configuration of "N"_2 is

(σ1s)^2(σ^"∗"1s)^2(σ2s)^2(σ^"∗"2s)^2(π2p_x)^2(π2p_y)^2(σ2p_x)^2