beryllium, Be potassium, K titanium, Ti yttrium, Y
I gave my students this multiple choice question: Based on their locations in the periodic table, which element has chemical properties most similar to those of calcium, Ca?

Only one answer is correct among these 4 choices:
- beryllium, Be
- potassium, K
- titanium, Ti
- yttrium, Y

Could you tell me which one is correct?

beryllium, Be