Предмет: Химия, автор: aagureccc

Охарактиризуйте хімічний елемент номер4 номер14 номер20

Ответы

Автор ответа: ninaamchuk86

1

Ответ:

4) (He) з атомною масою 4.

14) (Si) з атомною масою 14.

20) (Ca) із з атомною масою 20.

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