Potassium (K)
Atomic number
19
Mass number
39
Electronegativity
0.82
Covalent radius
2.025
Atomic radius
2.77
Melting point
336.35
Boiling point
1032.0
Density
0.862
Specific heat
0.75
Electrical conductivity
0.139e6
Thermal conductivity
1.024