Primary XPS region: Ca2p
Overlapping regions: Mg KLL
Binding energies of common chemical states:
|Chemical state||Binding energy Ca2p3/2|
Charge referenced to adventitious C1s peak at 284.8eV.
About this element
Date of discovery: 1808
Name origin: Latin calcis
Discoverer: Sir Humphrey Davy
Obtained from: chalk, limestone, marble
Melting point: 1112.15 K
Boiling point: 1757.15 K
Molar volume: 26.20 × 10-6 m3/mol
Shell structure: 2,8,8,2
Electron configuration: [Ar]4s2
Oxidation state: 2
Crystal structure: cubic face centered
H. Davy first isolated calcium in 1808. It is the fifth most abundant element in the earth’s crust and is an important component for living organisms on the cellular level, as well as for the formation bones and teeth in higher organisms. Besides being an essential element for living things, calcium is used as a reducing agent in the extraction of thorium, zirconium, and uranium, and is an alloying agent in the production of aluminum alloys. Chemical refinery processes commonly use quicklime (CaO), which is also an important component in cement. Water-dissolving calcium compounds in the earth, such as limestone, form caves – including stalactites and stalagmites – and are the major cause of hard water.
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