H, C, I He, H, Al He, Ne, Ar Na, Ca, Al
I gave my students this multiple choice question: According to the Periodic Table of the Elements, which set of elements has similar properties?

Only one answer is correct among these 4 choices:
- H, C, I
- He, H, Al
- He, Ne, Ar
- Na, Ca, Al

Could you tell me which one is correct?

He, Ne, Ar