Problem: U-236 spontaneously decays to Br-87, X and three neutrons. What is element "X"? 1. Th 2. Pb 3. La 4. Ba

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Problem Details

U-236 spontaneously decays to Br-87, X and three neutrons. What is element "X"?
1. Th
2. Pb
3. La
4. Ba

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Based on our data, we think this problem is relevant for Professor Kowach's class at CCNY.