| Assertion: On decay, daughter nucleus shifts two places to the left from the parent nucleus. |
| Reason: An alpha particle carries four units of mass. |
A) Both assertion and reason are true and the reason is correct explanation of the assertion.
B) Both assertion and reason are true but reason is not the correct explanation of assertion.
C) Assertion is true, but the reason is false.
D) Assertion is false but the reason is true.
Correct Answer: B
Solution :
We know that an \[\alpha \text{-}\]particle carries 2 units of positive charge and four units of mass. On \[\alpha \text{-}\]decay, charge number of parent nucleus decreases by 2 units. As classification or grouping of elements is based on charge number, hence daughter nucleus shift two places to the left from the parent nucleus.
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