When most people hear the term "calcium," they usually refer to as being good for the bones. Actually, calcium is important to all living things. This chemical element also plays a significant role in the development of teeth, shells, and coral.

Calcium is an Alkaline Earth Metal, so is cannot be dissolved by water, or transformed by fire. Its atomic number is 20 - meaning it has 20 protons, and calcium's atomic mass is 40. This is because it has 20 protons plus 20 neutrons located in the nucleus of an atom. The number of electrons this element contains is also 20.

In 1808, Sir Humphrey Davy, an English chemist, discovered calcium. The amazing discovery of this element was an accident. When Davy was experimenting with electrolysis, and tried to remove elements from their compounds, he actually found calcium instead. Even though calcium wasn't discovered as an element until 1808, Egyptians, Greeks, and Romans used it...