faça um esboço da tabela periódica e localize os elementos representativos A, B, e C de acordo com ↓?

as configurações :

a) 1s², 2s², 2p6, 4s¹

b) 1s², 2s², 2p6, 3s², 3p²

c) 1s², 2s², 3s², 3p6, 4s², 3d10, 4p6

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