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The minimum distance between chains is 343.6 pm. Gray selenium is formed by mild heating of other allotropes, by slow cooling of molten selenium, or by condensing selenium vapor just below the melting point. Whereas other selenium forms are insulators, gray selenium is a semiconductor showing appreciable photoconductivity.
This is a list of the various reported boiling points for the elements, with recommended values to be used elsewhere on Wikipedia. ... 34 Se selenium (hexagonal, gray ...
34 Se selenium (vitreous) use: 453 K: 180 °C: 356 °F (trans. to gray) CRC: 180 °C ... Boiling points of the elements (data page) List of chemical elements
34 Se selenium; use: 95.48 CRC: 95.48 LNG: 95.48 WEL: 26 ... Values refer to the enthalpy change in the conversion of liquid to gas at the boiling point (normal, 101. ...
This Wikipedia page provides a comprehensive list of boiling and freezing points for various solvents.
Spectral lines of selenium: Other properties; ... melting point comment = | boiling point K = | boiling point C = | boiling point F = | boiling point ref = | boiling ...
The temperature at standard pressure should be equal to the normal boiling point, but due to the considerable spread does not necessarily have to match values reported elsewhere. log refers to log base 10 (T/K) refers to temperature in Kelvin (K) (P/Pa) refers to pressure in Pascal (Pa)
Hydrogen selenide is hazardous, being the most toxic selenium compound [3] and far more toxic than its congener hydrogen sulfide. The threshold limit value is 0.05 ppm. The gas acts as an irritant at concentrations higher than 0.3 ppm, which is the main warning sign of exposure; below 1 ppm, this is "insufficient to prevent exposure", while at ...