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POTASSIUM (19K39.0983)

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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
Melting Point 63.3°C Electronegativity 0.8Pauling's
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

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