Complete the statement.
Neon is ().

 - a compound
 - an elementary substance
You can tell whether neon 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 neon is Ne. This formula contains one symbol: Ne. So, the formula tells you that neon is made of one chemical element.
Substances made of only one chemical element are elementary substances. So, neon is an elementary substance.