How many letters can a chemical symbol contain?

• A. One to two letters.
• B. Three to four letters.
• C. Exactly five letters.
• D. It depends on the element.

Answer: (A)

One or two letters. In standard chemical notation, each element has a symbol that is either a single capital letter (H, C, N) or a capital letter followed by a lowercase letter (He, Na, Fe). This keeps symbols short and easy to read across the periodic table, while still being unique. There are no standard symbols with three or more letters, so saying it depends on the element isn’t correct for ordinary notation.