What is the bond order of the $F_2$ molecule?

Find out the bond order in $He_2, He_2^{+}, O_2$ and $O_2^{+}$ respectively.

$AX$ is a covalent diatomic molecule where $A$ and $X$ are second row elements of the periodic table. Based on Molecular Orbital Theory,the bond order of $AX$ is $2.5$. The total number of electrons in $AX$ is ........... (Round off to the nearest integer).

How many ions of the following have a bond order of $2.5 ?$
$N_2^{-} ; NO^{-} ; C_2^{-} ; N_2^{+} ; C_2^{2-} ; CN^{+}$

The total number of antibonding molecular orbitals,formed from $2s$ and $2p$ atomic orbitals in a diatomic molecule is . . . . . .

Give features of Molecular Orbital $(MO)$ theory: