Question

Use the following MO diagram for Be2, Be2+, and Be2-. Based on this diagram,


Be2+ is more stable than Be2, and Be2 is more stable than Be2-.
Be2- is more stable than Be2, and Be2 is more stable than Be2+.
Be2+ and Be2- are both more stable than Be2.
Be2 is more stable than either Be2+ or Be2-.

Answer 1

@radar @timo86m

Answer 2

the stability comes from the bond order, a molecule with a more positive BO is more stable.

Bond order =\(\dfrac{1}{2}(bonding~e-antibonding~e)\)

So fill in the diagram and determine the bond order.