Укажите s-элементы
1)хлор 2)аргон 3)фосфор 4)бериллий 5)барий 6)стронций
Варианты ответа:
A 4, 5, 6
Б 2, 3, 5
В 1, 4, 5
Г 1, 3, 6
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