Посмотри на таблицу химических элементов. Определи зарядовое число атома С.
Периодическая таблица Д. И.Менделеева
Запиши изотоп этого химического элемента, если массовое число изотопа равно 19.
ответ: зарядовое число изотопа ::C
равно ...​

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