Chemicool
Er
68
167.26
Erbium
General
|
States
|
Energies
|
Oxidation & Electrons
|
Appearance & Characteristics
Reactions
|
Other Forms
|
Radius
|
Conductivity
|
Abundance
Encyclopedia Britannica articles
General
Name
Erbium
Symbol
Er
atomic number
68
Atomic weight
167.26
Density @ 293 K
9.05 g/cm3
Atomic volume
18.4 cm3/mol
Group
Rare Earth, Lanthanides
discovered
1843
States
state (s, l, g)
s
melting point
1795.2 K
boiling point
3173 K
Heat of fusion
19.90 kJ/mol
Heat of vaporization
261.0 kJ/mol
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Energies
1st ionization energy
588.7 kJ/mole
electronegativity
1.24
2nd ionization energy
1151 kJ/mole
electron affinity
50 kJ/mole
3rd ionization energy
2194 kJ/mole
Specific heat
0.17 J/gK
heat atomization
317 kJ/mole atoms
Oxidation & Electrons
Shells
2,8,18,30,8,2
electron configuration
[Xe] 4f12 6s2
minimum oxidation number
0
maximum oxidation number
3
min. common oxidation no.
0
max. common oxidation no.
3
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Appearance & Characteristics
structure
hcp: hexagonal close pkd
color
silvery-white
uses
alloys, photogr. filter
toxicity
hardness
mohs
characteristics
Reactions
reaction with air
vigorous, =>Er2O3
reaction with 6M HCl
mild, =>H2, ErCl3
reaction with 6M HCl
mild, =>H2, ErCl3
reaction with 15M HNO3
mild, =>Er(NO3)3
reaction with 6M NaOH
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Other Forms
number of isotopes
6
hydride(s)
ErH2 ErH3
oxide(s)
Er2O3
chloride(s)
ErCl3
Radius
ionic radius (2- ion)
pm
ionic radius (1- ion)
pm
atomic radius
176 pm
ionic radius (1+ ion)
pm
ionic radius (2+ ion)
pm
ionic radius (3+ ion)
103 pm
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Conductivity
thermal conductivity
14.5 J/m-sec-deg
electrical conductivity
14.1 1/mohm-cm
polarizability
22.7 A^3
Abundance
source
Monazite(phosphate),bastnaesite
rel. abund. solar system
-0.601 log
abundance earth's crust
0.4 log
cost, pure
270 $/100g
cost, bulk
$/100g
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