Question

In the electronic configuration, outermost orbit number is considered as:

• A. period
• B. group
• C. octet
• D. none of these

Answer 1

The correct option is A period

In the electronic configuration, the outermost orbit number is same as the period number. This can be validated by oxygen is $1s^{2}2s^{2}2p^4$ and it belongs to second period, Similarly for Sulphur $1s^{2}2s^{2}2p^{6}3s^{2}3p^4$ and it belongs to third period.

Thus the answer is option A-period.