<|system|>
Complete the statement.
Gold is ().
A: an elementary substance
B: a compound</s>.
<|user|>
Can you answer based on context?
<|assistant|>
You can tell whether gold 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 gold contains one atomic symbol: Au. So, the formula tells you that gold is composed of only one chemical element.
Since gold is composed of only one chemical element, gold is an elementary substance.