Chemicool
Cs
55
132.9054
Cesium
General
|
States
|
Energies
|
Oxidation & Electrons
|
Appearance & Characteristics
Reactions
|
Other Forms
|
Radius
|
Conductivity
|
Abundance
Encyclopedia Britannica articles
General
Name
Cesium
Symbol
Cs
atomic number
55
Atomic weight
132.9054
Density @ 293 K
1.873 g/cm3
Atomic volume
71.07 cm3/mol
Group
Alkali Met.
discovered
1860
States
state (s, l, g)
s
melting point
301.6 K
boiling point
978 K
Heat of fusion
2.092 kJ/mol
Heat of vaporization
67.740 kJ/mol
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Energies
1st ionization energy
375.7 kJ/mole
electronegativity
0.79
2nd ionization energy
2421.8 kJ/mole
electron affinity
45.506 kJ/mole
3rd ionization energy
kJ/mole
Specific heat
0.24 J/gK
heat atomization
79 kJ/mole atoms
Oxidation & Electrons
Shells
2,8,18,18,8,1
electron configuration
[Xe] 6s1
minimum oxidation number
0
maximum oxidation number
1
min. common oxidation no.
0
max. common oxidation no.
1
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Appearance & Characteristics
structure
bcc: body-centered cubic
color
yellow/silvery
uses
photocells, IR lamps
toxicity
hardness
0.2 mohs
characteristics
softest metal
Reactions
reaction with air
vigorous, = CsO2
reaction with 6M HCl
vigorous, = H2, CsCl
reaction with 6M HCl
vigorous, = H2, CsCl
reaction with 15M HNO3
vigorous, = CsNO3
reaction with 6M NaOH
vigorous, = H2, CsOH
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Other Forms
number of isotopes
1
hydride(s)
CsH
oxide(s)
Cs2O
chloride(s)
CsCl
Radius
ionic radius (2- ion)
pm
ionic radius (1- ion)
pm
atomic radius
265 pm
ionic radius (1+ ion)
181 pm
ionic radius (2+ ion)
pm
ionic radius (3+ ion)
pm
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Conductivity
thermal conductivity
35.9 J/m-sec-deg
electrical conductivity
48.9 1/mohm-cm
polarizability
59.6 A^3
Abundance
source
Li extractn by-product
rel. abund. solar system
-0.429 log
abundance earth's crust
0 log
cost, pure
1100 $/100g
cost, bulk
$/100g
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