Final answer:
Salt (NaCl) is an example of a compound, as it consists of sodium and chlorine atoms chemically bonded in a 1:1 ratio, unlike elements which have only one type of atom.
Step-by-step explanation:
Among the options provided, salt (NaCl) is an example of a compound. Unlike elements which contain only one type of atom, compounds like salt consist of two or more different types of atoms, specifically sodium (Na) and chlorine (Cl), that are chemically joined in a fixed ratio.
In this case, they combine in a 1:1 ratio to form sodium chloride. It's important to note that when naming compounds and determining their chemical formula, one must understand the elements involved, their quantities, and their positions on the periodic table to correctly name them.