Periodic table of the elements
ArgonPotassiumCalcium
19
K
Potassium
39.0983
2
8
8
1
19
K
Potassium
39.0983
2
8
8
1
General
NamePotassium
SymbolK
Number19
Chemical seriesAlkali metals
Group / Period1 / 4
Blocks-block
CAS registry number7440-09-7

Physical properties
Statesolid
Density0.89 g/cm3
Melting point336.53 K (63.38°C, 146.08°F)
Boiling point1032 K (759°C, 1398°F)
Critical point

Atomic properties
Atomic Weight39.0983 g/mol
Crystal structurecubic body centered
Electronegativity0.82
Atomic radius220 pm
Atomic radius (calculated)243 pm
Electron configuration[Ar] 4s1
Electrons per shell2, 8, 8, 1
Number of protons19
Number of neutrons20

Other languages
SpanishPotasio
PortuguesePotássio
FrenchPotassium
GermanKalium
ItalianPotassio
RussianКалий
PolishPotas
Chinese
Arabicبوتاسيوم
TurkishPotasyum
DutchKalium


Periodic table of the elements
ArgonPotassiumCalcium