On the basis of electronic configuration justify that the second and third periods contain 8 elements each 4th and 5th periods contain 18 elements each and the 6th period 32 elements.

Explanation

To justify the number of elements in the second, third, fourth, fifth, and sixth periods based on electronic configuration, we can analyze the orbitals and their capacities for holding electrons.

### Step-by-Step Solution:

1. **Second and Third Periods (8 Elements Each)**:
- The second period consists of the 2s and 2p orbitals.
- The 2s orbital can hold a maximum of 2 electrons (1 orbital x 2 electrons/orbital).
- The 2p orbitals consist of 3 orbitals, which can hold a maximum of 6 electrons (3 orbitals x 2 electrons/orbital).
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