- Elements in the same group on the periodic table of elements have similar properties
- Calcium / beryllium belongs to alkaline earth metal family , group 2 on the periodic table
- Hence, beryllium has the most similar chemical properties to calcium

So, beryllium has the most similar chemical properties to calcium
Q: Based on their locations in the periodic table, which element has chemical properties most similar to those of calcium, Ca?
Context:
- Elements in the same group on the periodic table of elements have similar properties 
- Calcium / beryllium belongs to alkaline earth metal family , group 2 on the periodic table