a. 1s 2s? 2p® 3s 3p® 3d10 4s² 4p3 b. 1s2 1p® 2s2 2p® 3s2 3p® 4s2 3do 4p3 c. 1s 2s 2p® 3s 3p® 4s2 3d10 4p® d. 1s 2s 3s18

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