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b. 1s2 2s2 2p6 3s2 3p6 4s2
c. 1s2 2s2 2p6 3s2 3p6 4s2 3d8
d. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 3f9
e. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 3f14 4d10 5p6 6s2 4f14