What is the atomic symbol for calcium?

The atomic symbol for calcium is represented as Ca. This symbol is derived from the first two letters of the element's name, with 'C' representing calcium and 'a' being the subsequent vowel. Calcium is a chemical element with the atomic number 20, and it belongs to the group of alkaline earth metals in the periodic table.

In contrast to the other options: Cl stands for chlorine, which is a different element entirely; Cu denotes copper, yet another distinct element; and C represents carbon, which also is not related to calcium. Understanding these symbols is crucial, as they provide a standardized way to communicate about elements in scientific contexts.