67
Ho
Holmium
164.930332
Basic Information
Bohr Model
Descriptive Numbers
Mass
Periodic Position
Classification
Abundance
Color
Atomic Radius
Temperature
Density
Heat
Speed of Sound
Electrical Resistance
Magnetic Properties
Elasticity
Hardness
Etymology
Discovery & Isolation
Production & Use
Radioactivity
Electron Affinity
Dipole Polarity
Lattice
Electron & Quantum
List of Compounds
Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-60-0
CID Number
CID23988
DOT Number
3089
Mendeleev Number
33
Pettifor Number
24
Space Group Number
194
Glawe Number
23
Mass
Atomic Mass
164.930332 Da
Uncertainty
0.00002
Periodic Position
X Position
14
Y Position
8
Period
6
Group
N/A
Classification
Block
f
Category
Lanthanides
Geochemical
Rare Earth and Similars
Goldschmidt
Lithophilic
Electrical Type
Conductive
Abundance
Seawater
2.2e-13 kg/L
Sun
5e-8 mole ratio to silicon
Earth Crust
0.0000013 g
Solar System
8.9e-8 mole ratio to silicon
Meteorites
0.0000059 %
Color
Jmol
#00FF9C
Molcas Gv
#00FF9C
CPK
#FF1493
Atomic Radius
Empirical
175
Calculated
226
Rahm
273
Uff
340.9
Mm3
267
Alvarez
281
Covalent (Cordero)
192
Covalent (Pyykko)
166
Covalent (Pyykko Double)
133
Metallic
176.2
Temperature
Melting/Freeze (USE)
1734 °K
Melting/Freeze (WEL)
1734 °K
Melting/Freeze (CRC)
1747 °K
Melting/Freeze (LNG)
1747 °K
Boiling/Density (USE)
2873 °K
Boiling/Density (WEL)
2993 °K
Boiling/Density (CRC)
2973 °K
Boiling/Density (LNG)
2993 °K
Boiling/Density (Zhang)
2873 °K
Curie Point
20 Tc
Density
STP
8.79 kg/cm³
Solid (WEL)
8795 kg/cm³
Solid (CRC)
8800 kg/cm³
Solid (LNG)
8790 kg/cm³
Liquid (CR2)
8340 kg/cm³
Heat
Molar Volume
18.74 cm³/mol
Atomic Volume
18.7 cm³
Heat Of Fusion CRC
17 kJ/mol
Heat Of Fusion LNG
16.8 kJ/mol
Heat Of Fusion WEL
17 kJ/mol
Evaporation USE
301 kJ/mol
Evaporation LNG
71 kJ/mol
Evaporation WEL
265 kJ/mol
Evaporation Zhang
251 kJ/mol
Molar Heat
27.15 J/molK
Heat Capacity USE
0.164 J/gK
Heat Capacity CRC
27.15 J/gK
Heat Capacity LNG
27.15 J/gK
Heat Capacity WEL
27.2 J/gK
Thermal Expansion
0.0000112 1/K
Adiabatic Index
N/A
Speed of Sound
Extensional
2760 m/s
Electrical Resistance
293k
814 nΩm
Magnetic Properties
Order
paramanyetic
Neel Point
132 Tn
Susceptibility
0.0000055 m3/kg
Elasticity
Shear Modulus
26.3 GPa
Bulk Modulus
40.2 GPa
Poisson Ratio
0.231 ν
Youngs Modulus
64.8 GPa
Hardness
Brinell
500–1250
Vickers
412–600
Etymology
Description
It is a relatively soft and malleable silvery-white metal. It is stable in dry air at room temperature. It oxidizes in humid air and high temperatures. It is in the lanthanide series. It is a rare earth metal and is found in monazite and gadolinite minerals. It has unusual magnetic properties. It has six radioisotopes in addition to one natural isotope (Ho-165). Among these, Ho-163 is the most stable with a half-life of 4570 years. Holmium is used in metal alloys and is also known to stimulate metabolism. In 1879 Per Theodor Cleve and J.L. It was discovered by Soret in Switzerland. The name Holmium comes from the Greek word Holmia, meaning Sweden. While it should be known that all holmium compounds are highly toxic, initial findings suggest that they may not pose much danger. However, it poses a fire risk in powder form.
Language Of Origin
Latin
Origin Of Word
From the New Latin word Holmia, which means Stockholm
Meaning
Stockholm
Symbol Origin
place name
Etymological Description
It comes from the Latin Holmia, meaning Stockholm.
Discovery & Isolation
Observed/Predicted By
J.-L. Soret and M. Delafontaine
Observed/Discovery Year
1878
Discovery Location
Isolated Sample By
T. Cleve
Isolated Sample Year
1879
Production & Use
Sources
It is found in gadolinite. It is most abundant in monazite, which consists of 50% rare earth element and 0.05% typically holmium.
Uses
It has little practical use. However, it has extraordinary magnetic properties that are promising for the future.
Radioactivity
Half Life
Stable
Lifetime
Stable
Neutron Mass Absorption
0.015
Neutron Cross Section
65
Electron Affinity
Electron Affinity (kJ/mol)
32.61
Electron Affinity (pauling)
1.23
Electron Affinity (ghosh)
0.207795
Dipole Polarity
Accepted
156
Uncertainty
10
C6 GB
2280
Lattice
Constant Internal Default Radius
3.58
Strucutre
HEX
Angles
π/2, π/2, 2 π/3
Electron & Quantum
Oxidation States
0,2,3
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f11
Quantum Number
4I15/2
Electron Configuration Semantic
[Car] 4f11 6s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
29
Shells-4
8
Shells-5
2
Ionization Energies-0
581
Ionization Energies-1
1140
Ionization Energies-2
2204
Ionization Energies-3
4100
List of Compounds
1-10 of 25 compounds
| Formula | Names |
|---|---|
| Ho | holmium holmium metal |
| HoBr3 | holmium(III)bromide tribromoholmium |
| HoCl3 | holmium chloride holmium(III) chloride holmium trichloride trichloroholmium |
| HoF3 | holmium(III)fluoride trifluoroholmium |
| HoI3 | holmium(III)iodide triiodoholmium |
| HoN | holmium nitride |
| HoSb | holmium antimonide antimony, compound with holmium (1:1) |
| HoSi2 | holmium silicide |
| Ho2O3 | holmium(III) oxide holmia holmium(+3) cation; oxygen(-2) anion holmium oxide rare earth |
| Ho2S3 | holmium sulfide |
