July 2021 1 6 Report
формула высшего оксида некоторого элемента - ЭО3.какую конфигурацию валетных электронов может иметь этот элемент в основном состоянии?
1) 3s2 3p4
2) 2s2 2p4
3) 3s1 3d5
4) 4d6
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