Question

Explain why be2 does not exist with using molecular orbital theory

Answer 1

Answer: Because no energy is released when Be2 is formed as per Molecular Orbital Theory (MOT).

Explanation:

• It can be shown using MO diagram.
• As per MOT; when atomic orbitals (A.O.) mix, MO's are formed.
• AO's lose their identity when they mix.
• There are four electrons in Beryllium
• AO stacking of Be goes like:
• 1s-2, 2s- 2.
• There have to be 8 electrons in Be2
• Molecular stacking of Be2 goes like:
• 1σ- 2 , 1σ*-2, 2σ- 2, 2σ*- 2.
• There is clearly no gain or loss of energy.
• So Be2 will not be formed under normal circumstances.