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Define abcd!
Mn: 1s22s22p63s23p63d54s2 Mn2+: 1s22s22p63s23p63d5
The answer will depend on what ABCD is (or are). And since you have not bothered to provide that information, I cannot provide a sensible answer.
400 square cm
"abcd is not a parallelogram or it does not have any right angles." ~(P and Q) = ~P or ~Q