Using M.O. diagram and occupancy of electrons in orbitals, arrange the following molecular species in increasing order of their stabilities:
(i) ${\mathrm{H}}_2$ (ii) ${{\mathrm{H}}_2}^{-}$ (iii) ${{\mathrm{H}}_2}^{+}$

What information does M.O. theory provide for ${\mathrm{O}}_2,{\mathrm{O}}_2^{+},{\mathrm{O}}_2^{-},{\mathrm{O}}_2^{2-}$molecular species with regard to bond length?

Discuss the shapes of molecular orbitals formed by the combination of the following atomic orbitals :

 $2{\mathrm{p}}_{\mathrm{x}}+2{\mathrm{p}}_{\mathrm{x}}$

Discuss the shapes of molecular orbitals formed by the combination of the following atomic orbitals :

$2{\mathrm{p}}_{\mathrm{z}}+2{\mathrm{p}}_{\mathrm{z}}$