Sulfur

16

S

32.065(5)

  • Name: Sulfur
  • Symbol: S
  • Atomic number: 16
  • Atomic weight: 32.065(5)
  • CAS Registry ID: 7704-34-9
  • Group name: Chalcogen
  • Period number: 3
  • Block: p-block
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Description

Sulfur is a nonmetal that is a lemon yellow solid in its natural state. Sulfur has an atomic weight of 32.065, a melting point of 239.38 °F, and a boiling point of 832.5 °F. Sulfur has an odor that is sometimes characterized as a ‘rotten egg’ smell. Some common uses of sulfur include: as a major ingredient in black gunpowder, as a fungicide, as a bleaching agent of paper products, in the manufacture of cellophane and rayon, and in the vulcanization of rubber.

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Isolation

Pure sulfur deposits are located throughout the world near hot springs and volcanic sites. However, some isolation procedures can be used to extract pure sulfur from other sources.

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Large scale isolation of sulfur for commercial purposes is carried out through two main processes: the Claus process, and the Frasch process. The Clause process extracts sulfur from hydrogen sulfide that is produced through hydro-desulfurization of natural gas and petroleum; there are two steps two the Claus process. In the first step, the thermal process, hydrogen sulfide gas is heated in a combustion chamber to 1562 °F. Air is injected into the chamber to complete the reaction and produce sulfur dioxide and water. In the second step of the Claus process, the catalytic step, sulfur dioxide is reacted with hydrogen sulfur in a heated combustion chamber. Cooling temperatures cause condensation, and pure elemental sulfur and water are the products of the reactions.

The Fracsh process of sulfur isolation uses sulfur from underground reserves. During this process, holes are dug down into the sulfur deposits, pipes are interested into the holes, and superheated steam is forced down the pipes into the sulfur. The sulfur melts, and it is removed by pumping more air down a central pipe bringing the sulfur up to the surface.


General
Name Sulfur
Symbol S
Number 16
Chemical series nonmetals
Group 16
Period 3
Block p
Appearance lemon yellow brick
Standard atomic weight 32.065(5) g·mol−1
Electron configuration [Ne] 3s2 3p4
Electrons per shell 2, 8, 6
Atomic properties
Crystal structure orthorhombic
Oxidation states −1, ±2, 4, 6 (strongly acidic oxide)
Electronegativity 2.58 (Pauling scale)
Ionization energies 1st: 999.6 kJ·mol−1
(more) 2nd: 2252 kJ·mol−1
(more) 3rd: 3357 kJ·mol−1
Atomic radius 100 pm
Atomic radius (calc.) 88 pm
Covalent radius 102 pm
Van der Waals radius 180 pm
Physical properties
Phase solid
Density (near r.t.) (alpha) 2.07 g·cm−3
Liquid density at m.p. 1.819 g·cm−3
Melting point 388.36 K (115.21 °C, 239.38 °F)
Boiling point 717.8 K (444.6 °C, 832.3 °F)
Critical point 1314 K, 20.7 MPa
Heat of fusion (mono) 1.727 kJ·mol−1
Heat of vaporization (mono) 45 kJ·mol−1
Heat capacity (25 °C) 22.75 J·mol−1·K−1
Miscellaneous
Magnetic ordering
Electrical resistivity (20 °C) (amorphous) 2×1015Ω·m
Thermal conductivity (300 K) (amorphous) 0.205 W·m−1·K−1
Thermal expansion
Speed of sound (thin rod)
Young's modulus
Shear modulus
Bulk modulus 7.7 GPa
Poisson ratio
Mohs hardness 2.0
Vickers hardness
Brinell hardness
CAS registry number 7704-34-9

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