Question

For a molecule Nb=Na will the molecule be stable? Explain why.

Answer 1

It can be determined by bond order. Higher is the bond order , more prominent will be the strength / stability of molecule .  

I ) If Nb > Na, at that point molecule would be stable .  

II ) If Nb = Na, at that point molecule formation won't occur.  

iii) If Nb < Na, at that point molecule would be unstable .

Answer 2

For a molecule with  $N_b$ = $N_a$ ,  the molecule is unstable.

Explanation:

Bond order is the number of bonds present between the two atoms.

The formula of Bond order =$\frac{1}{2}\times (\text{Number of bonding electrons}-\text{Number of anti-bonding electrons})$

Bond order =$\frac{1}{2}\times (N_b-N_a)$

When $N_b$ > $N_a$ , Bond order > 1, molecule is stable

$N_b$ < $N_a$ , Bond order < 1, molecule is unstable

$N_b$ = $N_a$ , Bond order = 0 , molecule does not exist

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