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Assetion In alpha-decay atomic number of...

Assetion In `alpha`-decay atomic number of daughter nucleus reduces by 2 units from the parent nucleus.
Reason An `alpha` particle carries four units of mass.

A

If both assertion and Reason are true and the Reason is the correct explanation of the assertion.

B

If both assertion and Reason are true but the reason is not the correct explanation of the assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
We know that on `alpha`-particle carries 2 units of positive charge and four unit of mass. On `alpha`-decays, charge number of parent nucleus decreases by 2 units, as classification or grouping of elements is based on charge number, hence daughter nucleus shifts two places to the left from the parennt nucleus.
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