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""(90)Th^(228) emits four alpha and one ...

`""_(90)Th^(228)` emits four alpha and one beta particles. Number of neutrons in daughter emement is

A

129

B

190

C

232

D

138

Text Solution

Verified by Experts

The correct Answer is:
A
`""_(90)Th^(228)underset(-4alpha)to""_(82)X^(212)underset(-beta)to""_(83)Y^(212)` dughter element
Number of neutrons = mass number - atomic number
`=212-83=129`
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