# How many antibonding orbitals are in nitrogen gas, N_2?

The lowest energy orbital is the σ^✳(1s) orbital. This is not a valence-shell orbital.
The lowest energy antibonding orbital in the valence shell is the σ^✳(2s) orbital. Then come two degenerate and unfilled π^✳(2p) orbitals. Finally, the highest energy orbital is the σ^✳(2p) orbital.