According to MOT, two atomic orbitals overlap resulting in the formation of molecular orbital formed. Number of atomic orbitals overlapping together is equal to the molecule orbital formed. The two atomic orbital thus formed by LCAO (linear combination of atomic orbital) in the phase or in the different phase are known as bonding and antibonding molecular orbitals respectively. The energy of bonding molecular orbital is lower than that of the pure atomic orbitals by an amount `Delta`. This known as the stabilization energy. The enerby of antibonding molecular orbital in increased by `Delta'` (destabilisation energy).
Q. Which of the following pairs of molecule can exist?

Options

A. `He_(2) and Be_(2)`
B. `O_(2)^(2-) and Na_(2)`
C. `O_(2)^(2-) and H_(2)^(2-)`
D. `Be_(2) and Mg_(2)`

Answer

B