Назвать химические элементы!!!
Срочно
1) 1S2 2S2 2P6 3S2 3P2

2) 1S2 2S2 2P6 3S2 3P3

3) 1S2 2S2 2P6 3S2 3P4

4) 1S2 2S2 2P6 3S2 3P5​
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