3 Answers
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Di-beryllium…..
We we draw the molecular orbital diagram for neutral di-beryllium we find a bond order of zero since there are four bonding electrons and four anti-bonding electrons.
If there existed a di-beryllium anion with one additional electron, Be2^-, then it would have a bond order of ½.
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Be2 Bond Order
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An ion does not have a bond order. And the ion you have chosen does not exist.
