# What is the combining form meaning calcium?

Calcium is an ELEMENT; $Z = 20$. And it is the 5th most metal in the Earth's crust. As an alkaline earth, i.e. Group 2 of the Periodic Table, it commonly forms $C {a}^{2 +}$ ions. And salts such as $C a C {O}_{3}$, $C a C S {O}_{4}$, and $C a {\left(O H\right)}_{2}$ are very common.....