Problem: Use the molecular orbital diagram shown to determine which of the following is most stable.a. F22+b. Ne22+c. F22-d. O22+e. F2

FREE Expert Solution

Recall that the bond order tells us the strength and length of a bond: a higher bond order means the bond is stronger and shorter.

higher bond orderhigher bond strength → more stable


We can calculate for the bond order using:

Bond Order=12[# of e- in bonding MO-# of e- in antibonding MO]

bonding MOs → without an asterisk (e.g., σ1s)
antibonding MOs those with an asterisk (e.g., σ1s*)


a. F22+

            Group            Valence Electrons
F        7A                   2 × 7 e14 e
From +2 charge:        – 2 e
                                 Total:  12 valence e

Bond Order=12[8-4]

Bond Order = 2.0



b. Ne22+

          Group            Valence Electrons
Ne      8A                   2 × 8 e16 e
From +2 charge:        – 2 e
                                 Total:  14 valence e


Bond Order=12[8-6]

Bond Order = 1.0



c. F22-

            Group            Valence Electrons
F        7A                   2 × 7 e14 e
From charge:        +2 e
                                 Total:  16 valence e

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Problem Details

Use the molecular orbital diagram shown to determine which of the following is most stable.

a. F22+

b. Ne22+

c. F22-

d. O22+

e. F2

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