## Answers

For the given atoms we write nuclear balenced equation based on decay

a) Thrus (x-decay) A 225 - Th 90 X-decay - Het 221 Ra 88 2 b) Bi-210 (« decay) 206 210. - Bi 83 d-decoy - A.. Het 2 TI 81 c) cesium - 137 (ß decay) 137 es Badecay o + - 1 3 + 137 3a 56 55 d) fin - 126 (r-decay) 126.

.
P-decay, ° B t sb -1 51 e) F-18 (Bt emission) 18 Rt emission o 18 for the decay given They odays with mass in their reuclear given different atau 1.

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