Be: 1s2 2s2
P: 1s2 2s2 2p6 3s2 3p3
O2- : 1s2 2s2 2p6
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Verified answer
Be: 1s2 2s2
P: 1s2 2s2 2p6 3s2 3p3
O2- : 1s2 2s2 2p6