1) Электронная формула атома магния:

А. 1s^2 2s^2

Б. 1s^2 2s^2 2p^1

В. 1s^2 2s^2 2p^6 3s^2

2) Электронная формула атома натрия:

А. 1s^2 2s^2 2p^6 3s^2 3p^2

Б. 1s^2 2s^2 2p^6 3s^1

В. 1s^2 2s^2 2p^1

Г. 1s^2 2s^2 2p^5

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