The following electronic transitions occur when Lithium atoms are sprayed into a hot flame; , which — Atomic Structure Chemistry Question

💡 Solution & Explanation

Emission of light occurs when an electron transitions from a higher energy level to a lower energy level. Based on the Aufbau principle ordering ($2s < 2p < 3p < 4s < 3d$), step III ($3d \to 3p$) goes from higher to lower energy, and step V ($4s \to 3p$) goes from higher to lower energy. Thus, III and V are emissions. Therefore, correct answer is B.