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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 `72` respectively, what are these numbers for `A_(4)`.

Text Solution

Verified by Experts

The successive process may be expressed as
`._(72)A^(180) overset(alpha)rarr_(70) A_(1)^(176) overset(beta^(-))rarr_(71) A_(2)^(176) overset(alpha)rarr_(69) A_(3)^(172) overset(gamma)rarr_(69) A_(4)^(172)`.
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