Question

which element shares similar properties with titanium (ti)?
calcium (ca)
zirconium (zr)
rubidium (rb)

Explanation:

Elements in the same group of the periodic table have similar chemical properties. Titanium (Ti) is in group 4. Zirconium (Zr) is also in group 4, while Calcium (Ca) is in group 2 and Rubidium (Rb) is in group 1.

Answer:

Zirconium (Zr)