Calcium is the 20th element of the periodic table. These calcium facts contain chemical and physical data along with general information and history. Basic Calcium Facts Name: Calcium Atomic Number: 20 Element Symbol: Ca Group: 2 Period: 4 Block: s Element Family: Alkaline Earth Atomic Mass: 40.078(4) Electron Configuration: [Ar]4s2 Full: 1s22s22p63s23p64s2 (full) Discovery: Sir Humphry Davy in 1808 Davy is well known for his […]