Basic Information

Name: Potassium 
Symbol: K 
Atomic Number: 19 
Atomic Mass: 39.0983 amu 
Melting Point: 63.65 °C (336.8 K, 146.57 °F) 
Boiling Point: 774.0 °C (1047.15 K, 1425.2 °F) 
Number of Protons/Electrons: 19 
Number of Neutrons: 20 
Classification: Alkali Metal 
Crystal Structure: Cubic 
Density @ 293 K: 0.862 g/cm3 
Color: silvery
Date of Discovery: 1807 
Discoverer: Sir Humphrey Davy 
Name Origin: potash 
Symbol Origin: From the Latin word kalium 
Uses: glass, soap 
Obtained From: minerals (carnallite)