kalciumi
Kalciumi, also known as calcium, is a chemical element with the symbol Ca and atomic number 20. It is an alkaline earth metal and the fifth most abundant element by mass in the Earth's crust. In biology it is the fifth most abundant element in the human body. The term kalciumi is used in some languages to refer to this element.
Physically, calcium is a soft, silvery-gray metal that tarnishes in air to a dull oxide layer and
Occurrence and compounds: Calcium occurs primarily in minerals such as calcite [CaCO3], aragonite, gypsum [CaSO4·2H2O], and
Production and uses: Commercially, calcium is produced by processing limestone to lime (CaO) and then to Ca(OH)2,
Biology and health: Calcium is essential for bone and teeth mineralization, muscle contraction, nerve signaling, and
History and etymology: The name derives from Latin calx, meaning lime. Calcium was first isolated in 1808