Предмет: Химия, автор: solomiya66

10. Оксид елемента головної підгрупи II групи масою 2,8 г повністю розчинився в хлоридній кислоті масою 3,65 г. Визначте цей елемент. Складіть схему будови атома, електронну формулу.

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Автор ответа: kami0553

3

вот так!!)
Описала все действие

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