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A radioactive nucleus undergoes a series...

A radioactive nucleus undergoes a series of decays according to the sequence :
`A overset(beta)rarr A_(1) overset(alpha)rarr A_(2) overset(alpha) rarr A_(3)`
If the mass number and atomic number of `A_(3)` are 172 and 69 respectively, what are the mass number and atomic number of A ?

A

`56,23`

B

`180,72`

C

`120,52`

D

`84,38`

Text Solution

Verified by Experts

The correct Answer is:
B
`A overset ( beta ) to A _(1) overset( alpha) to A _(2) overset(alpha ) to A _(3)`
`"" _(72) X ^(180) overset (-1 ^(e^(0)))to73 X ^(180) overset("" _(2)He ^(4))to""_(71) X ^(176)`
`""_(71) X ^(176) overset("" _(2) He ^(4)) to "._(69) X ^(172)`
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A radioactive nucleus undergoes a series of decays according to the sequence : A overset(beta)rarr A_(1) overset(alpha)rarr A_(2) overset(alpha) rarr A_(3) If the mass number and atomic number of A_(3) are 172 and 69 respectively, what rate the mass number and atomic number of A ?

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