Посмотри на таблицу химических элементов. Определи зарядовое число атома С. Периодическая таблица Д. И.МенделееваЗапиши изотоп этого химического элемента, если массовое число изотопа равно 19.Ответ: зарядовое число изотопа ::Cравно ...
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