Radon
Physical properties
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Physical state @ 20°C:
Gas
Color:
Ordinary temperatures: Colorless [4]
Below the freezing point: Radon exhibits a brilliant phosphorescence, which becomes yellow as the temperature is lowered, and orange-red at the temperature of liquid air
Molecular weight (g/mol):
222 (Approximately) [1]
Melting point (°C):
-71 [1]
Boiling point (°C):
-62 [1]
Critical temperature (°C):
104 [2,4]
Critical pressure (kPa):
6280 [4]
Density (g/cm
3
):
Gas: 0.00973 [1,4]
Liquid: 4.400 [4]
Molar volume (cm
3
):
50.50
Solubility:
Water: 230 cm
3
/L (Approximately, 20 °C) [3]