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Name them by using prefixes and group number
Example: H2O is hydrogen dioxide. if the first element has one valent electron, you don't use mono and just name it as is.
Rule: Name metal as is and change the ending of the non metal to ide
Example: CO2 is Carbon dioxide
Polyatomic ion: made up of more than one atom and acts as a single particle
Example: Nitrate is NO3
Multivalent: use roman numerals to know which one you are using
Example : Fe2O3 is Iron(III) oxide
Example: H2 + O2 is H2O
Example: H2O is H2 + O2
Example: Nal + CaCl will be NalCl + Ca
Example: BaSO + CaNO would be BaNo + CaSO
Example: CH + O2 is CO2 +HO2 + thermal energy