Problem: Use the drawing of MO energy diagram to predict the bond order of Be2+ and Be2–. Do you expect Be2– to exist in the gas phase?

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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*). 


For Be2+:

            Group             Valence Electrons

Be         2A                   2 × 2 e4 e

+1 charge                                  – 1 e    



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Use the drawing of MO energy diagram to predict the bond order of Be2+ and Be2. Do you expect Be2 to exist in the gas phase?