Periodic Table of Elements

20

Calcium

40.078

Calcium Facts

Chemical Symbol Ca
Atomic number 20
Atomic weight 40.078
Soft gray alkaline earth metal
Fifth most abundant element by mass in the Earth's crust
Essential for living organisms
Is part of bone, teeth and shells, calcium is the most abundant metal by mass in many animals
Calcium salts are soluble in water
Is the lightest of the alkaline earth metals