В реакции Pa → ₈₂²⁰⁸Pb + xα + y-₁β число нейтронов в Pb на 19 меньше, чем в Pa. Найдите y.
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📝 Detailed explanation
n(Pb) = 208 − 82 = 126; n(Pa) = 145 → A(Pa) = 236, Z = 91. 236 − 208 = 28 = 4x → x = 7. 91 = 82 + 2·7 − y → y = 5.
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