Question

how ionic and covalent compounds are named

Answer 1

for IONIC: 
the metal name followed by nonmetal ion (-ide) 
for ex: NaCl is Sodium Chloride 
or MgS is Magnesium Sulfide 

for COVALENT: 
(for 2 nonmetals) 
use prefixes 
1- mono 
2- di 
3- tri 
4- tetra 
5- penta 
6- hexa 
7- hepta 
8- octa 
9- nona 
10- deca 

(but if first metal is one, dont use prefix) 
soo 

ex: CO is Carbon Monoxide 
CO2 is Carbon Dioxide 
N2S3 is Dinitrogen Trisulfide 
P4O10 is Tetraphosphorus Decoxide