I agree Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our website without changing the browser settings you grant us permission to store that information on your device.
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|
|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|