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Potassium is silvery-white, soft, and light. It is the second lightest known metal (lithium is the first). Never found native, potassium is found in minerals in most soils. It is an essential componenet for plant growth and in human and animal nutrition. Since it is one of the most electropositive metals, potassium is very reactive. Like other alkali metals, it decomposes and can ignite spontaneously in water.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(19K39.0983)||Heat of Vaporization||496.0k-cal/g-atom|
|CAS #||7440-09-7||Atomic Volume||45.3W/D|
|First Ionization Energy||100K-cal/g-mole|
|Boiling Point||760°C||Covalent Radius||2.03Angstroms|
|Density||0.856g/cm3||Mohs Hardness @ 20°C||0.5|
|Themal Conductivity||0.24cal/cm2/cm/s/°C||Electrical Resistivity @ 200°C||21.85µΩ-cm|
|Specific Heat @ 25°C||0.177cal/g°C||Crystal Structure||Cubic, body centered|
|Heat of Fusion||14.6k-cal/g-atom|