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You get this answer by performing the following:

Mass # Mass # 4

Atomic # Parent symbol -> Atomic # Daughter symbol + 2 He

238 234 4

92 U -> 90 Th + 2 He

Both sides must equal the same thing, so if you figure out what plus 4 = 238 and what plus 2 = 92, you can figure out the element is formed through decay. The resulting element in this case is Thorium.

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