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Alcatueste s schemele electronice pentru elementele cu numere atomice 1 3 11 19.

Răspuns :

1s1
1s1 2s2
1s1 2s2 2p6 3s2
1s1 2s2 2p6 3s2 3d8
1s1
1s1 2s2
1s1 2s2 2p6 3s2
1s1 2s2 2p6 3s2 3d8