Question 11: Atoms & Nuclei

Question

Assertion : 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.

Accepted Answer

We know that $$\alpha$$-particle carries two units of positive charge and four units of mass. In $$\alpha$$-decays, charge number of parent nucleus decreases by 2 units. Also mass number reduces by four units.

Answer

Both assertion and reason are true and reason is the correct explanation of assertion

Answer

Both assertion and reason are true but reason is not the correct explanation of assertion

Answer

Assertion is true but reason is false

Answer

Both assertion and reason are false.

Atoms & Nuclei

Assertion : 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.

Choose the correct answer: