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A radioactive element A on disintegratio...

A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic number 90 and atomic mass 234, the element A is:

A

`._(92)^(238)U`

B

`._(88)^(234)Ra`

C

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

D

`._(91)^(234)Pa`

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The correct Answer is:
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