Calculate the bond order for $H_2^+$,$He_2^+$,and $He_2^{2+}$.

Which of the following molecules would have the same magnetic nature regardless of whether $sp$ mixing is operative or not?

The paramagnetic behaviour of $B_2$ is due to the presence of

Answer the following questions:
$(i)$ Give the molecular orbitals and their types formed by $LCAO$ from $2s, 2p_{x}, 2p_{y}$ and $2p_{z}$ atomic orbitals.
$(ii)$ Provide the energy order of molecular orbitals for $Li_{2}, Be_{2}, C_{2}, N_{2}, O_{2}$ and $F_{2}$.

Assertion : $B_2$ molecule is diamagnetic. Reason : The highest occupied molecular orbital is of $\sigma$ type.

Explain $H_{2}$ molecule by molecular orbital theory.