You can tell whether bromomethane 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 bromomethane, CH3 Br, contains three atomic symbols: C for carbon, H for hydrogen, and Br for bromine. So, the formula tells you that bromomethane is composed of three chemical elements bonded together.
Since bromomethane is composed of multiple chemical elements bonded together, bromomethane is a compound.
Complete the statement.
Bromomethane is ().
A: an elementary substance
B: a compound