Methane

Helium and Neon

Alkaline earth metal halates

Argon

Mercury in Liquids, Compressed Gases, Molten Salts and Other Elements

Carbon dioxide in non-aqueous solvents at pressures less than 200 KPA

Krypton, xenon, and radon

Ammonia, amines, phosphine, arsine, stibine, silane, germane and stannane in organic solvents