How come CrO3 is Chromium trixiodie ? Isnt the prefix tri used only for covalent bonds ?

Question

chmvijay · Answer

nope
di for two O
tri for 3 O
tetra for 4 O
penta for 5 O
CO2- carbon dioxide 
similarly

chmvijay · Answer

P2O5- phosphorous pentaoxide :)

chmvijay · Answer

i dont know what it mean only for covalent bonds ?

anonymous · Answer

Covalent bonds are usually between a nonmetal and another nonmetal . An ionic bond is usually between a non metal and a metal . We use mono , di , tri , tetra ....etc. when naming elements in covalent bonds . If so , how come CrO3 is named chromium trioxide ? (Chromium is a metal oxygen is a non metal ) . If you have CrO3 how would you name it ? (We use IUPAC rules )

chmvijay · Answer

its called chromium trioxide
these are prefixes and used in several naming things they re general u can use for anyhing
it is not connected to only covalent bonds

anonymous · Answer

When we have an ionic compound we use roman numerals , can you name it using roman numerals ?
When i tried it didnt make sense

chmvijay · Answer

sodiumchloride

chmvijay · Answer

i didnt get u what u r saying

anonymous · Answer

Ok here is the question in another way , 
Is CrO3 a possible compound ? Explain using the zero sum rule

chmvijay · Answer

yup its possible compound|dw:1379828019335:dw|