Caesium Element Properties

Caesium

p54
Xe
Xenon
s55
Cs
Caesium
s56
Ba
Barium
General
Name(Caesium)
Symbol(Cs)
Number(55)
Group Number(1)
Group(Alkali metals)
Block(s)
Density(1.873 g/cm3)
Atomic Weight(132.9054 g/mol)
Atomic Volume(71.07 cm3/mol)
Discover(1860)


States
State(Solid)
Melting Point(301.59 K)
Boiling Point(944 K)
Triple Point(Nil)
Critical Point(1938 K)
Heat of Fusion(2.09 kJ/mol)
Heat of Vaporization(63.9 kJ/mol)


Energies
First Ionization Energy(375.7 kJ/mole)
Second Ionization Energy(2421.8 kJ/mole)
Third Ionization Energy(Nil)
Electronegativity(0.79)
Electron Affinity(45.506 kJ/mole)
Specific Heat(0.24 J/gK)
Heat Atomization(79 kJ/mole atoms)


Oxidation and Electrons
Shells(2,8,18,18,8,1)
Electron Configuration([Xe] 6s1)
Minimum Oxidation Number(0)
Maximum Oxidation Number(1)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(1)


Appearance and Characteristics
Crystal Structure(body centered cubic)
Characteristics(softest metal)
Color(yellow/silvery)
Uses(photocells, IR lamps)
Hardness(0.2 mohs)
Toxicity(None)


Reactions
Reaction with Air(vigorous, =>CsO2)
Reaction with 6M HCl(vigorous, =>H2, CsCl)
Reaction with 15M HNO3(vigorous, =>CsNO3)
Reaction with 6M NaOH(vigorous, =>H2, CsOH)


Other Forms
Number of Isotopes(1)
Hydride(CsH)
Oxide(Cs2O)
Chloride(CsCl)


Radius
Atomic Radius(265 pm)
Ionic Radius (1+ ion)(181 pm)
Ionic Radius (1- ion)(Nil)
Ionic Radius (2+ ion)(Nil)
Ionic Radius (2- ion)(Nil)
Ionic Radius (3+ ion)(Nil)


Conductivity
Thermal Conductivity(35.9 J/m-sec-deg)
Electrical Conductivity(48.9 1/mohm-cm)
Polarizability(59.6 A3)


Abundance
Source(Li extractn by-product)
Relation Abundance Solar System(-0.429 log)
Abundance Earths Crust(Nil)


p54
Xe
Xenon
s55
Cs
Caesium
s56
Ba
Barium

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