Rare gases

Liquid oxygen has a pale blue color and is strongly paramagnetic and can be suspended between the poles of a powerful horseshoe magnet. Liquid oxygen has a density of 1.141 kg/L and is cryogenic. freezing point: 50.5 K (−368.77 °F; −222.65 °C), boiling point: 90.19 K (−297.33 °F, −182.96...

Argon (Ar) is a monatomic, colorless, odorless, tasteless and nontoxic gas, present in the atmosphere at a concentration of just under 1 (0.934%) by volume. Argon is a member of a special group of gases known as the "rare," "noble," or "inert" gases. Other gases in this group are helium, neon,...