Chemicool
Ho
67
164.9304
Holmium
General
|
States
|
Energies
|
Oxidation & Electrons
|
Appearance & Characteristics
Reactions
|
Other Forms
|
Radius
|
Conductivity
|
Abundance
Encyclopedia Britannica articles
General
Name
Holmium
Symbol
Ho
atomic number
67
Atomic weight
164.9304
Density @ 293 K
8.80 g/cm3
Atomic volume
18.7 cm3/mol
Group
Rare Earth, Lanthanides
discovered
1879
States
state (s, l, g)
s
melting point
1743.2 K
boiling point
2873 K
Heat of fusion
12.20 kJ/mol
Heat of vaporization
241.0 kJ/mol
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Energies
1st ionization energy
580.7 kJ/mole
electronegativity
1.23
2nd ionization energy
1139 kJ/mole
electron affinity
50 kJ/mole
3rd ionization energy
2204 kJ/mole
Specific heat
0.16 J/gK
heat atomization
301 kJ/mole atoms
Oxidation & Electrons
Shells
2,8,18,29,8,2
electron configuration
[Xe] 4f11 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
toxicity
hardness
mohs
characteristics
Reactions
reaction with air
vigorous, = Ho2O3
reaction with 6M HCl
mild, = H2, HoCl3
reaction with 6M HCl
mild, = H2, HoCl3
reaction with 15M HNO3
mild, = Ho(NO3)3
reaction with 6M NaOH
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Other Forms
number of isotopes
1
hydride(s)
HoH2 HoH3
oxide(s)
Ho2O3
chloride(s)
HoCl3
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)
104.1 pm
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Conductivity
thermal conductivity
16.2 J/m-sec-deg
electrical conductivity
11.4 1/mohm-cm
polarizability
23.6 A^3
Abundance
source
Monazite(phosphate),bastnaesite
rel. abund. solar system
-1.051 log
abundance earth's crust
0.1 log
cost, pure
740 $/100g
cost, bulk
$/100g
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