Identify each of the following compounds as ionic or covalent.
a. NH_{4}NO_{3} b. Na_{2}S_{2}O_{3} c. SF_{6}
You are asked to determine whether a compound is ionic or covalent.
You are given the compound formula.
a. Ionic. Ammonium nitrate contains two polyatomic ions (NH_{4}^{+} and NO_{3}^{-}), so it is an ionic compound that consists only of nonmetal elements.
b. Ionic. Sodium thiosulfate contains the sodium ion (Na^{+}) and the polyatomic thiosulfate ion (S_{2}O_{3}^{2-}). It is an ionic compound that consists of a metal ion and a polyatomic ion.
c. Covalent. Sulfur hexafluoride contains only nonmetals and no polyatomic ions.