Question

Electron in sample of $L{i}^{2+}$ ions are exited to a higher energy state 'n'. during transition from $n^{th}$ orbit only one spectral line can we obeseved in brackett series. How many maximum no. of spectral line are obseved in Balmer series?

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is C 3

For Brackett series transition should be from n to $4^{th}$ excited state $n>4$

since only one spectral line observed hence $n=5$

For Balmer spectral lines are $5\to 2,4\to 2,3\to 2$

Total numbr of spectral line $=3$.