July 2022 2 25 Report
1.аЗаполните таблицу:

Химический элемент Атомный номер Номер периода Номер группы Количество электронов на внешнем уровне
Na
6
3 5

1б Определите ряд элементов которые имеют одинаковое число электронов на внешнем уровне.
А) Na, C, CI
B) P, N, Mg
C) Al, B, F
D) O, S, Se
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