氪气 (Krypton)

Krypton is a rare inert gas with a full outer electron shell, making it extremely stable and不易形成化学键。 Its atomic number is 36, and its volume fraction in the Earth's atmosphere is approximately 1 ppm.

Under electrical excitation, krypton emits a bright silver-white light, making it used in some high-intensity lighting, such as photography flashlights and some laser applications. At room temperature, it is a colorless odorless gas, and when cooled, it can solidify into white crystalline solid.

Additionally, Krypton, due to its extremely low thermal conductivity，It is widely used as a layer inert filling gas in high-end double-glazed windows, significantly improving insulation and heat resistance.