All elements are metals. All elements have six electrons. All elements are pure substances. All elements exist in the solid phase.
I gave my students this multiple choice question: Which describes a property of all elements?

Only one answer is correct among these 4 choices:
- All elements are metals.
- All elements have six electrons.
- All elements are pure substances.
- All elements exist in the solid phase.

Could you tell me which one is correct?

All elements are pure substances.