Sulfur ionic crystal radius

Other nonmetallic elements also are found to have van der Waals radii approximately equal to their ionic radii. For sulfur, for example, in the layer crystal molybdenite, the van der Waals radius effective be-... 

C—C bonds). NaCN is also used in the extraction of Ag and Au (see eq. 22.4 and Box 22.2). At 298 K, NaCN and KCN adopt an NaCl-type structure, each [CN] ion freely rotating (or having random orientations) about a fixed point in the lattice and having an effective ionic radius of 190 pm. At lower temperatures, transitions to structures of lower symmetry occur, e.g. NaCN undergoes a cubic to hexagonal transition below 283 K. Crystals of NaCN and KCN are deliquescent, and both salts are soluble in water and are highly toxic. Fusion of KCN and sulfur gives potassium thiocyanate, KSCN. 

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