Question

What is the maximum number of emission lines when the excited electron of a H atom in n = 6 drops to the ground state?

• A. 21
• B. 15
• C. 6
• D. 10

Answer 1

The correct option is B

15

The number of lines produced when an electron from the $n^{th}$ shell drops to the ground state is $\frac{n(n-1)}{2}$

So the required number of emission lines is $\frac{6(6-1)}{2}=15$