Properties of the Elements
Potassium
Chemical Symbol  K
Atomic Number  19
Electron Configuration  [Ar]4s1
Stable Phase at 298.15 K  body centered cubic
Density (298 K)
 0.86  g/cc
Atomic Mass  39.096
Young's Modulus, ksi
 
Melting Temperature, K
336.35 
Boiling Temperature, K
1032