Complete the statement.
Tin is ().

 - an elementary substance
 - a compound
You can tell whether tin is an elementary substance or a compound by counting the number of symbols in its chemical formula. A symbol contains either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for tin is Sn. This formula contains one symbol: Sn. So, the formula tells you that tin is made of one chemical element.
Substances made of only one chemical element are elementary substances. So, tin is an elementary substance.