Se   {selenium.se}  
     
 
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Selenium properties (lit.):

  • Element Number: 34
  • Chemical group: nonmetals
  • Group, period, block: 16, 4, p
  • Atomic mass: 78.96(3) g/mol
  • Electron configuration: [Ar] 3d10 4s2 4p4
  • Polymorphs: gray, alpha, vitreous
  • Density: 4.81 (gray form), 4.39 (alpha), 4.28 (vitreous) g/ml
  • Melting point: 221 C (494 K)
  • Boiling point: 685 C (958 K)
  • Density of melted selenium: 3.99 g/ml (494 K)
  • Critical point: 1766 K, 27.2 MPa
  • Heat of vaporization: 95.48 kJ/mol
  • Heat capacity: 25.363 J/(molK)
  • Oxidation states: -2, 0, +2, +4, +6
  • Electronegativity: 2.55 (Pauling)
  • Natural isotopes: 74Se (0.87%), 76Se (9.36 %), 77Se (7.63%), 78Se (23.78%), 80Se (49.61 %), 82Se (8.73 %)
  • Other properties: compounds of selenium are toxic
  • Warnings: TOXIC
  • Risk Statements: 23/25-33-53
  • Safety Statements: 20/21-28-45-61
  • RID/ADR: 9 (III)
  • UN 3077

 
 
 
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