If We Use the Same Molecular Orbital Energy Level Scheme

Short Answer

If we use the same molecular orbital energy level scheme for the valence orbitals in the NO ion as is used for diatomic O₂ through N₂ molecules,
σ_2s < σ*_2s < σ_2p(z)< π_2p(y), π_2p(x) < π*_2p(y), π*_2p(x)< σ*_2p(z)
how many unpaired electrons are there in the antibonding orbitals of the system?