Question

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

• A. Both assertion and reason are true and the reason is the correct explanation for the assertion.
• B. Both assertion and reason are true but the reason is not the correct explanation for the assertion.
• C. The assertion is true but the reason is false.
• D. The assertion is false but the reason is true.

Answer 1

The correct option is A

Both assertion and reason are true and the reason is the correct explanation for the assertion.

The chemical properties of an element depend on the number of electrons in the outermost shell or orbit. Since all the elements in the group of a periodic table have the same number of electrons in the outermost shell, therefore, they have similar chemical properties. Therefore, the reason given to us is a correct explanation for the assertion made.