Science Periodic Table - Elements - Potassium Symbol K Atomic Number 19 Relative Atomic Mass 12C = 12.0000 39.0983 Atomic Radius pm 227 First Ionisation Energy kJ mol-1 418.8 Electronegativity 0.82 Density kg m-3 862 [293 K] 828 [l., m.p.] Molar Volume cm3 45.36 Thermal Conductivity W m-1 K-1 102.4 [300 K] Melting Point K 336.80 Boiling Point K 1047 Number of Isotopes 18 Ground State Electron Configuration [Ar]4s1 Term Symbol 2S1/2 Discovery Discovered by Sir H. Davey (London, England) in 1807 Name Derived From English potash; Latin kalium Name in Other Languages  Croatian Kalij  Danish kalium  Dutch kalium  Finnish kalium  French potassium  German Kalium  Italian potassio  Norwegian kalium  Portuguese potássio  Spanish potasio  Swedish kalium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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