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Calcium


Calcium is a soft alkaline earth metal known since ancient Roman times.

Name Calcium
Atomic Number 20
Atomic Weight 40.078 u
Symbol Ca
Melting Point ( °C ) 1115 K
Boiling Point ( °C ) 1757 K
Density (g/cm3) 1.55
Earth crust (%) 5%
Discovery (Year) 1808
Group 2
Electron configuration [Ar] 4s2
Ionization energy (eV) 589.622 KJ/ml

Other useful information:

Period= 4, Abundance: Earth- 7.72 log, Solar 4.79log, Source: Calcite (oxide), State of Matter: Solid , alkaline earth metal, Atomic Radius: 197 pm, Ionic Radius: 114 pm, Electronegativity: .9 unities, number of Isotopes: 6, Common Oxidation Numbers:+2 ,

Reactivity:

Water: reacts slowly, Air: reacts fast, Acids: highly reactive, Bases: no reaction,

Discovered:

Calcium was known since ancient Roman times but it was not isolated until 1808 by Sir Humphry Davy in The United Kingdom


Uses:

Calcium is used in mostly in clinical research and nutritional studies

Interesting facts:

Every human contains 1 kg of calcium in their body, calcium is the main component of the bone, some foods contain calcium, a gram of the element cost 0.48 $/100g or depending on it purity, its a conductor of electricity, Calcium is not radioactive,

Resources :

<ref>http://www.rsc.org/periodic-table/element/20/calcium</ref>

<ref>http://education.jlab.org/itselemental/ele020.html</ref> <ref>http://www.webelements.com/calcium/isotopes.html</ref>