Question

What is the relation between the number of sub-energy levels and main energy level?

• A. $n$
• B. $n+1$
• C. $n-1$
• D. $n^2$

Answer 1

The correct option is A $n$

1. When the main energy level is K shell (n=1), the number of sub-energy level is only 1 (s-orbital).
   
2. When the main energy level is L shell (n=2), the number of sub-energy level is 2 (s-orbital and p-orbital).
   
3. When the main energy level is M shell (n=3), the number of sub-energy level is 3 (s-orbital, p-orbital and d-orbital).
   
4. When the main energy level is N shell (n=4), the number of sub-energy level is 4 (s-orbital, p-orbital, d-orbital and f-orbital).

Hence, the relationship between main energy level and number of sub-energy levels is n. The answer is A