Potassium Element Properties

Potassium

p18
Ar
Argon
s19
K
Potassium
s20
Ca
Calcium
General
Name(Potassium)
Symbol(K)
Number(19)
Group Number(1)
Group(Alkali metals)
Block(s)
Density(0.862 g/cm3)
Atomic Weight(39.0983 g/mol)
Atomic Volume(45.46 cm3/mol)
Discover(1807)


States
State(Solid)
Melting Point(336.53 K)
Boiling Point(1032 K)
Triple Point(336.35 K)
Critical Point(Nil)
Heat of Fusion(2.334 kJ/mol)
Heat of Vaporization(79.870 kJ/mol)


Energies
First Ionization Energy(418.8 kJ/mole)
Second Ionization Energy(3051.3 kJ/mole)
Third Ionization Energy(4411.3 kJ/mole)
Electronegativity(0.82)
Electron Affinity(48.385 kJ/mole)
Specific Heat(0.75 J/gK)
Heat Atomization(90 kJ/mole atoms)


Oxidation and Electrons
Shells(2,8,8,1)
Electron Configuration([Ar] 4s1)
Minimum Oxidation Number(0)
Maximum Oxidation Number(1)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(1)


Appearance and Characteristics
Crystal Structure(cubic body centered)
Characteristics(soft)
Color(silvery-white)
Uses(fertilizer, low-Na salt)
Hardness(0.5 mohs)
Toxicity(None)


Reactions
Reaction with Air(vigorous, =>KO2)
Reaction with 6M HCl(vigorous, =>H2, KCl)
Reaction with 15M HNO3(vigorous, =>H2, NOx, KNO3)
Reaction with 6M NaOH(vigorous, =>H2, KOH)


Other Forms
Number of Isotopes(3)
Hydride(KH)
Oxide(K2O)
Chloride(KCl)


Radius
Atomic Radius(227 pm)
Ionic Radius (1+ ion)(152 pm)
Ionic Radius (1- ion)(Nil)
Ionic Radius (2+ ion)(Nil)
Ionic Radius (2- ion)(Nil)
Ionic Radius (3+ ion)(Nil)


Conductivity
Thermal Conductivity(102.5 J/m-sec-deg)
Electrical Conductivity(138.9 1/mohm-cm)
Polarizability(43.4 A3)


Abundance
Source(Sylvite, carnallite (misc))
Relation Abundance Solar System(3.576 log)
Abundance Earths Crust(4.3 log)


p18
Ar
Argon
s19
K
Potassium
s20
Ca
Calcium

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