Physical and Chemical Properties

Krypton is a colorless, odorless gas in its natural state and is mostly unreactive, since it is one of the noble (or inert) gases. However, although krypton was originally believed to be completely inert, this has been proven wrong. Krypton forms a few compounds, most notable krypton difluoride, or KrF2. Krypton is characterized by its green and orange spectral lines. In its solid state, krypton is a white crystalline. It boils at an extremely low temperature of -152.9˚ C and melts at -157.39˚ C. Krypton is 2.8 times denser than air, with a density of 3.749 grams/Liter. Krypton's atomic number is 36 and it has an atomic mass of 83.80. Krypton has a complete outer shell of eight valence electrons, like all other noble gases.