1. None of these
2. ? = 139
56Ba
3. ? = 240
93Rn
4. ? = 142
5. ? = 236
6. ? = 4
2He
7. ? = 139
36Kr
236 92U −→ 94 36Kr + ? + 3 1 0n
236 = 94+x +3 => x = 236-97 = 139
92 = 36 + y +0 => y = 56
so 139 56 Ba
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Verified answer
236 92U −→ 94 36Kr + ? + 3 1 0n
236 = 94+x +3 => x = 236-97 = 139
92 = 36 + y +0 => y = 56
so 139 56 Ba