August 2021 1 2 Report
Сколько электронов в атомах элементов:
а) с зарядом ядра +1, +6, +7, +15;
б) с порядковым номером |) 3, 12, 16, 35;
||) 9, 26, 29, 34;
в) F, Cl, Br, I?
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