Potassium was discovered by Sir Humphrey Davy at 1807 in England.<
Origin of name: from the English word "potash" (pot ashes) and the Arabic word "qali"
meaning alkali (the origin of the symbol K comes from the Latin word "kalium").
Atomic Number: 19
Atomic Weight: 39.0983
Melting Point: 336.53 K (63.38°C or 146.08°F)
Boiling Point: 1032 K (759°C or 1398°F)
Density: 0.89 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 4 Group Number: 1 Group Name: Alkali Met