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.
Complete the statement.
Tin is ().
A: an elementary substance
B: a compound