Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and …

Calcium was named after the Latin term calx meaning lime, and is a reactive silvery metallic element found in Group 2 of the periodic table. It was first isolated in 1808 in England when Sir Humphry …

Calcium has twenty protons and twenty neutrons in its nucleus, and twenty electrons in four shells. It is located in group two, period four and block s of the periodic table.

Nov 21, 2020 · Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. The chemical symbol for Calcium is Ca. Calcium is an …

Jan 9, 2026 · calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth most …

Calcium is a chemical element of the periodic table with chemical symbol Ca and atomic number 20 with an atomic weight of 40.0784 u and is classed as alkaline earth metal and is part of group 3 …

Calcium, symbol Ca, is an alkaline earth metal in the second column of the periodic table. Its atomic number is 20. It is in the fourth row of the periodic table, beneath magnesium. It has an electron …