[Dergyll]

Hey guys back again

I'm SO confused today with Binary Molecular Compounds...

In my book (Chem: The Central Science) the heading says "Names and Formulas of Binary Molecular Compounds" and an example is Cl₂O and it's name is dichlorine monoxide, another example is P₄S₁₀ being called tetraphosphorus decasulfide...

On a worksheet labled Binary Ionic Compounds, barium fluoride is labeled BaF₂ and Na₃N is labeled Sodium Nitride!

But I thought all binaries are named using the prefixes...Whats going on? Is there some rules I'm ignoring?
 
Thanks alot
Derg

[Yggdrasil]

Only covalent compounds are named using the prefixes.  You should not include the prefixes when naming ionic compounds.