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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

`56,23`

B

`180,72`

C

`120,52`

D

`84,38`

Text Solution

Verified by Experts

The correct Answer is:
B
`Aoverset(beta)rarrA_(1)overset(alpha)rarrA_(2)overset(alpha)rarrA_(3)`
`._(72)X^(180)overset(-1e^(0))rarr._(73)X^(180)overset(._(2)He^(4))rarr._(71)X^(176)`
`._(71)X^(176)overset(._(2)He^(4))rarr._(69)X^(172)`
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