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81. Определите зарядовое число Z и массовое число А частицы, обозначенной буквой х, в символической записи ядерной реакции: 1) 73Li + 42Не →105В + х; 2) 63Li + x →31H + 42Не; 3) 2713Al + 42Не → 3014Si + х.
81. Определите зарядовое число Z и массовое число А час
