Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?

A. Smaller electronegativity of alkali metals
B. Smaller ionic radius of these metals
C. De-excitation of electrons from higher energy levels to low energy level
D. Excitation of electrons from low energy levels to higher energy levels

Correct Answer: De-excitation of electrons from higher energy levels to low energy level ✔

Last Updated: February 11, 2021