Question

Which formula is an ionic compound?
Responses

N2
upper case N subscript 2 end subscript

NO2
upper case N O subscript 2 end subscript

NaF
upper case N lower case A upper case F

CO2
upper case C O subscript 2 end subscript

Answer 1

The formula that represents an ionic compound from the options given is **NaF** (sodium fluoride). Ionic compounds are typically formed between metals and nonmetals, and in this case, Na (sodium) is a metal and F (fluorine) is a nonmetal.

The other compounds listed are:
- N2: a diatomic molecule (molecular compound).
- NO2: a molecular compound (nitrogen dioxide).
- CO2: a molecular compound (carbon dioxide).