They break down when reacting with acids. They can be altered with an electric current. They are always metals. They cannot be divided into smaller substances.
I gave my students this multiple choice question: Which of the following is a characteristic of elements?

Only one answer is correct among these 4 choices:
- They break down when reacting with acids.
- They can be altered with an electric current.
- They are always metals.
- They cannot be divided into smaller substances.

Could you tell me which one is correct?

They cannot be divided into smaller substances.