Question

Assertion (A): Second period consists of 8 elements.

Reason (R): Number of elements in each period is four times the number of atomic orbitals available in the energy level that is being filled.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is true but R is false.

Explanation:

The second period has 8 elements, so A is true. Its filling involves 4 orbitals, each accommodating 2 electrons; therefore, R’s claim of four times the number of orbitals is false.