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A radioactive nucleus undergoes a series...

A radioactive nucleus undergoes a series of deacy according to the scheme.
`Aoverset(alpha)rarrA_(1)overset(beta^(-))rarrA_(2)overset(alpha)rarrA_(3)overset(gamma)rarrA_(4)`
If the mass number and atomic number of `A` are `180` and `172` respectively, what are these numbers for `A_(4)`.

A

172 and 69

B

174 and 70

C

176 and 69

D

176 and 70

Text Solution

Verified by Experts

The correct Answer is:
A
`""_(72)A^(180) overset(alpha)rarr ""_(70)A_(1)^(176) overset(beta)rarr ""_(71)A_(2)^(176) overset(alpha)rarr ""_(69)A^(172) overset(gamma)rarr ""_(69)A^(172)`
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