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8 June, 08:32

U-236 spontaneously decays to Br-87, X and three neutrons. What is element "X"? 1. Th 2. Pb 3. Ra 4. La 5. Ba

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  1. 8 June, 09:45
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    U-236 spontaneously decays to Br-87, X and three neutrons. The element X is 4. La, also known as Lanthanum, number 57 in the periodic system of elements.
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