Ответ:
Объяснение:
219/85At-----> 0/-1e + 219/86Rn
212/83Bi-----> 4/2He + 208/81Tl
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Verified answer
Ответ:
Объяснение:
219/85At-----> 0/-1e + 219/86Rn
212/83Bi-----> 4/2He + 208/81Tl
==================================