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Element Details

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CALCIUM (20Ca40.078)

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Element Description

The metallic element calcium has a silvery color and is harder than sodium, but softer than aluminum. The pure element is never found in nature uncombined, rather, it commonly occurs as limestone (CaCO<sub>3</sub>), gypsum (CaSO<sub>4</sub>”H<sub>2</sub>) and fluorite (CaF<sub>2</sub>). Calcium, one of the alkaline earth elements, reacts in air to form a white coating of nitride and reacts with water, alcohol and dilute acids with evolution of hydrogen. Calcium is the fifth most abundant element in the earth's crust.

Property Name Property Value Property Name Property Value
Atomic Code (20Ca40.078) Atomic Volume 29.9W/D
CAS # 7440-70-2 First Ionization Energy 141K-cal/g-mole
Electronegativity 1.0Pauling's
Melting Point 842°C Covalent Radius 1.74Angstroms
Boiling Point 1440°C Brinell Hardness 16-18
Density 1.54g/cm3 Linear Coefficient of Expansion @ 26-370°C 22.3x10-6K-1
Themal Conductivity 0.3cal/cm2/cm/s/°C Electrical Resistivity @ 20°C 3.7µΩ-cm
Specific Heat @ 25°C 0.149cal/g°C Crystal Structure Cubic, face centered
Heat of Fusion 52cal/g Modulus of Elasticity 3.2-3.8x106psi
Heat of Vaporization 1000cal/g Tensile Strength 6900psi

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