Potassium

Latin nameKalium
English namePotassium
chemical symbolK
atomic number19
relative atomic mass39,0983
period4
groupI.A
classificationalkali metals
discovery year1807
discovererH. Davy
melting point [°C]63,25
boiling point [°C]759,9
critical temperature [°C]1950
critical pressure [MPa]16
density [g cm-3]0,862
density at melting point [g cm-3]0,828
electronegativity [Pauling]0,82
stand. el. potential [V]−2,931
oxidation statesI
electron configuration[Ar]4s1
atomic radius [pm]243
covalent radius [pm]196
specific heat [J g-1K-1]0,75
heat of fusion [kJ mol-1]2,334
thermal conductivity [W m-1 K-1]102,5
el. conductivity [S m-1]1,64.107
1. ionizing potential [eV]4,3407
2. ionizing potential [eV]31,625
3. ionizing potential [eV]45,72
Mohs hardness0,4
Brinell hardness [MPa]0,363
Young's modulus [GPa]1,3
state at normal conditionssolid

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