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Potassium (₁₉K^39.0983)
[7440-09-7]

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Elemental Form


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.
Melting Point	63.3°C	Boiling Point	760°C
Density	0.856g/cm³	Themal Conductivity	0.24cal/cm²/cm/s/°C
Specific Heat @ 25°C	0.177cal/g°C	Heat of Fusion	14.6k-cal/g-atom
Heat of Vaporization	496.0k-cal/g-atom	Atomic Volume	45.3W/D
First Ionization Energy	100K-cal/g-mole	Electronegativity	0.8Pauling's
Covalent Radius	2.03Angstroms	Mohs Hardness @ 20°C	0.5
Electrical Resistivity @ 200°C	21.85µΩ-cm	Crystal Structure	Cubic, body centered