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A radiactive nucleus 'A' undergoes a ser...

A radiactive nucleus `'A'` undergoes a series of decays according to the following scheme:
`Aoverset(alpha)rarrA_(1)overset(beta)rarrA_(2)overset(alpha)rarrA_(3)overset(y)rarrA_(4)`
The mass number and atomic number `A` are `180` and `72` respectively. What are these number 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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