Type III compounds are the third rule to naming compounds. Type III compounds NEVER contain polyatomic ions and the prefix "mono-" is never used on the first element.
Mono - 1
Di - 2
Tri - 3
Tetra - 4
Penta - 5
Hexa - 6
Hepta - 7
Octa - 8
Nona - 9
Deca - 10
etc.
Ex: PCl5 = Phosphorus pentachloride
P4O6 = Tetraphosphorus hoxoxide
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