Question

What is the maximum number of emission lines obtained when the excited electron of a H atom in n = 5 drops to the ground state?

• A. 12
• B. 15
• C. 21
• D. 10

Answer 1

Answer: (D)

10

Answer 2

: Number of lines produced when electron from n^th shell drops to ground state is given by

$\frac{n(n - 1)}{2} = \frac{5(5 - 1)}{2} = 10$