Why does xenon glow light blue?

Xenon glows light blue when an electric current passes through it because the gas emits light as a result of excitation and subsequent relaxation of its atoms. When xenon atoms are energized, their electrons jump to higher energy levels. As these electrons return to their original states, they release energy in the form of light, with the specific wavelengths corresponding to a blue hue. This characteristic is particularly noticeable in xenon gas used in discharge lamps and certain types of lighting.