Element: Potassium (K)

Element (atom) NamePotassium
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameAlkali Metal
Group number (Periodic table)1
Period Number (Periodic table) 4
Atomic number19
Atomic Weight39.0983 (Ref: Jlab-ele019, Ciaaw-potassium, Nist-element 19)
39.10 (Ref: Lanl-19)
Atomic Radius275 pm (Van der Waals) (Ref: Lanl-19)
Density0.89 g/cm3 (Ref: Jlab-ele019)
Melting point63.38°C (Ref: Jlab-ele019)
65.5 °C (Ref: Lanl-19)
Boiling point759°C (Ref: Jlab-ele019, Lanl-19)
Electron Shell Configuration1s2 2s2 2p6 3s2 3p6 4s1
Oxidation States+1 (Ref: Jlab-ele019)
+1, −1 ​(a strongly basic oxide) (Ref: Lanl-19)
Ionization Energy4.341 eV (Ref: Jlab-ele019)
4.34066373  eV (Nist-element 19)
Number of Stable Isotopes2
InChI1S/K (Ref: Pubchem-Potassium)


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