text: In binary compounds the more electropositive element is placed first in the formula. The formal list is used. The name of the most electronegative element is modified to end in -ide and the more electropositive elements name is left unchanged.
  Taking the binary compound of sodium and chlorine: chlorine is found first in the list so therefore comes last in the name. Other examples are
  * PCl phosphorus pentachloride
  * CaP dicalcium triphosphide
  * NiSn nickel stannide
  * CrC tricosachromium hexacarbide