Note 447 — Chapter XV · THE GROUP IVA ELEMENTS—TITANIUM

Compounds of trivalent titanium are frequently referred to in English chemical and technical literature as ‘Titanous Compounds,’ the salts of the tetravalent element being tacitly recognised as ‘Titanic Compounds.’ In view of the existence of compounds of divalent titanium, to which the name ‘Titanous Compounds’ might be more logically applied, the former nomenclature cannot be regarded as altogether satisfactory, and it is therefore not adopted here.