Question

Draw and explain the molecular orbital diagram of Ne2 . On the basis of molecular orbital diagram, explain why Ne2 can note exist?

Answer 1

Bond order of Ne2 = (10-10) =0
So Ne2 is unstable ;Ne2 cannot exist

Answer 2

Molecular orbital diagram of $Ne_2$

Explanation:

• Neon atom has 10 electrons and its electronic configuration is $1s^22s^22p^6$. When $N_2$ molecule is considered, it has two neon atoms and thus is composed of 20 electrons.
• The electronic configuration and bond order of $N_2$ molecule is as follows:

Electronic configuration: $Ne_2 = (\pi^*_{2{py}})^2(\sigma^*_{2pz})^2$

Bond order = $\frac{1}{2}[N_b-N_a]$ = $\frac{1}{2}[8-8] = 0$

• As the bond order value for $N_2$ molecule is zero, it is unstable and cannot exist.
• The molecular orbital diagram of hypothetical $Ne_2$ molecule is given in the attachment.

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