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A radioactive element X has an atomic nu...

A radioactive element `X` has an atomic number of 100. It decays directly into an element `Y` which decays directly into an element `Z`. In both the processes either one `alpha` or one `beta-` particle is emitted. Which of the following statement could be true?

A

`Y` has an atomic number of `102`

B

`Z` has an atmic number of `101`

C

`Z` has an atomic number of `97`

D

`Z` has an atomic number of `99`

Text Solution

Verified by Experts

The correct Answer is:
D
`X` and `Y` can decay one `alpha` each or one `beta` each or X-decays, `1alpha`, Y-decays `1 beta` or X-decays `1 beta` or Y-decays `1alpha`. In either case (a), (b) and (c) cannot be true. Ans. (D)
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