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7N= 1s2, 2s2, 2p3
15P= 1s2, 2s2, 2p6, 3s2, 3p3
33As= 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p3
51Sb= 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p3