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.(92)^(238)U has 92 protons and 238 nucl...

`._(92)^(238)U` has 92 protons and `238` nucleons. It decays by emitting an alpha particle and becomes:

A

`._(92)^(234)U`

B

`._(90)^(234)U`

C

`._(92)^(235)Th`

D

`._(93)^(237)Th`

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The correct Answer is:
B
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