Предмет: Физика, автор: guta444

Очень прошу!!!!!!!!! помогите пожалуйста!!!!!!!

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Ответы

Автор ответа: fatt52

0

Ответ:

Объяснение:

2) 11 протонов 12 нейтронов (4)

3) 234/91 Pa (протоактиний)

4) 4/2He

1/1 p

1/0 n

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