Selenium

Physical properties


Physical state @ 20°C: Solid [4]
Color: Vitreous amorphous form: dark red to bluish-black [5]
Red monoclinic α-form: dark red, transparent [5].
Red monoclinic β-form: dark red, transparent [5].
Grey/metallic hexagonal crystal: grey to black [5].
Odor: Odourless [4]
Molecular weight (g/mol): 78.96 [1]
Melting point (°C): List of melting points 217 [1]
Boiling point (°C): List of boiling points 685 [1]
Critical temperature (°C): 1493 [3]
Density (g/cm3): Density list Vitreous amorphous form: 4.285 [1,5]
Red monoclinic α-form: 4.389 [1], 4.46 [5].
Grey/metallic hexagonal crystal: 4.189 [1], 4.81 [5].
Solubility: Water: Insoluble (20 °C) [4]