According to the nomenclature recommended by IUPAC, in the most simple case of a binary ionic compound with no possible ambiguity about the stoichiometry, the common name is written using two words.
The common name is written using two words. This was according to the nomenclature. This nomenclature is recommended by IUPAC. This was in the most simple case of a binary ionic compound with no possible ambiguity about the stoichiometry.