All elements in period 2 are metals. All elements in group 18 are metals. Metals are found on the left side of the periodic table. Metals are found on the right side of the periodic table.
I gave my students this multiple choice question: Which sentence about the periodic table of elements is true?

Only one answer is correct among these 4 choices:
- All elements in period 2 are metals.
- All elements in group 18 are metals.
- Metals are found on the left side of the periodic table.
- Metals are found on the right side of the periodic table.

Could you tell me which one is correct?

Metals are found on the left side of the periodic table.