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B. 34B= 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
C. 32C= 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2
D. 85d-= 84d= 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2