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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)Th`

C

`""_(92)^(235)U`

D

`""_(93)^(237)Np`

Text Solution

Verified by Experts

The correct Answer is:
B
Emission of alpha particle, dercreases the mass number by 4 and charge number by 2.
`:.` Decrease in mass number `=238-4=234`
Decreases in charge number `=92-2=90`
`""_(90)^(234)Th` is emittted.
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