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b)²²³₈₇Fr ---> β⁻ + ²²³₈₈Ra
c)²³⁸₉₂U ---> ⁴₂α + ²³⁴₉₀Th
d)⁴⁰₁₉K ---> β⁻ + ⁴⁰₂₀Ca
232 228
Th-----------> Ra
90 88
b)223 223
Fr----------> Rn
87 86
c) 238 234
U-----------> Th
92 90
d) 40 40
K-------------> A r
19 18