The following electronic transition occurs when lithium atoms are sprayed into a hot flame,
`2s overset(I)rarr 2p overset(II)rarr 3d overset(III)rarr 3p overset(IV)rarr 4s overset(V)rarr 3p`.
Which of the transition would result in the emission of light?

Options

A. I, II and IV
B. III and V
C. III, IV and V
D. All of these steps

Answer

B

Explanation

Subshell with lower `(n + l)` value is lower in eenergy and energy is emitted in transition from a subshell of higher energy to lower energy subshell.