Complete the statement.
Ozone is ().
A: an elementary substance
B: a compound
You can tell whether ozone is an elementary substance or a compound by counting the number of atomic symbols in its chemical formula. An atomic symbol consists of either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for ozone, O3, contains one atomic symbol: O for oxygen. So, the formula tells you that ozone is composed of only one chemical element.
Since ozone is composed of only one chemical element, ozone is an elementary substance.