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find the number of elements which are...

find the number of elements which are iosfiapher of `""_(92)U^(238)`
`""_(93)Th^(234),""_(90)TH^(232),""_(93)Np^(237),""_(96)Cm^(247)`

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The correct Answer is:
0
Neutrion excess`=238-2xx92=54`
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