Holmium Cesium Comparison
Periodic Table
Symbol
Ho
Cs
Group Number
Not Available
1
17
Period Number
6
6
Block
f block
s block
Element Family
Lanthanide
Alkali
CAS Number
7440600
29
7440462
40
Space Group Name
P63/mmc
Im_ 3m
Space Group Number
194.00
5
229.00
1
Facts
Interesting Facts
- Holmium metal is very soft and malleable.
- Holmium metal is well known for its corrosion resistivity.
Not Available
Sources
Found in Minerals, Mining, Ores of Minerals
Earth's crust, Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Marc Delafontaine
Robert Bunsen and Gustav Kirchhoff
Discovery
In 1878
In 1860
Abundance
Abundance In Universe
5 * 10-8 %
27
8 * 10-8 %
24
Abundance In Sun
~-9999 %
~0.0000008 %
20
Abundance In Meteorites
0.00 %
99+
0.00 %
38
Abundance In Earth's Crust
0.00 %
38
0.00 %
35
Abundance In Oceans
0.00 %
99+
0.00 %
17
Abundance In Humans
Not Available
0.00 %
17
Uses
Uses & Benefits
- Holmium metal has an ability to absorb neutrons, so this metal is used in nuclear reactors to keep the chain reactions of elements under control.
- Alloys of Holmium are used to produce Magnet.
- The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
- In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
Industrial Uses
NA
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research
Alloys
Biological Properties
Toxicity
Low Toxic
Mildly Toxic
Present in Human Body
No
Yes
In Blood
Not Available
0.00 Blood/mg dm-3
28
In Bone
Not Available
0.05 p.p.m.
26
Physical Properties
Melting Point
1,461.00 °C
30
28.50 °C
99+
Boiling Point
2,600.00 °C
99+
678.40 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gold
Luster
Metallic
NA
Hardness
Mohs Hardness
Not Available
0.20
25
Brinell Hardness
746.00 MPa
13
0.14 MPa
99+
Vickers Hardness
481.00 MPa
23
Not Available
Speed of Sound
2,760.00 m/s
30
Not Available
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Ho
Cs
Isotopes
Known Isotopes
34
5
36
3
Electronegativity
Pauling Electronegativity
1.23
37
0.79
99+
Sanderson Electronegativity
Not Available
0.22
33
Allred Rochow Electronegativity
1.10
30
0.86
99+
Mulliken-Jaffe Electronegativity
Not Available
0.62
26
Allen Electronegativity
Not Available
0.66
99+
Electropositivity
Pauling Electropositivity
2.77
17
3.21
2
Ionization Energies
1st Energy Level
581.00 kJ/mol
99+
375.70 kJ/mol
99+
2nd Energy Level
1,140.00 kJ/mol
99+
2,234.30 kJ/mol
8
3rd Energy Level
2,204.00 kJ/mol
99+
3,400.00 kJ/mol
16
4th Energy Level
4,100.00 kJ/mol
34
Not Available
Electrochemical Equivalent
2.02 g/amp-hr
29
4.96 g/amp-hr
3
Electron Work Function
Not Available
2.14 eV
99+
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
67
99+
55
99+
Electron Configuration
[Xe] 4f11 6s2
[Xe] 6s1
Crystal Structure
Hexagonal Close Packed (HCP)
Body Centered Cubic (BCC)
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
67
99+
55
99+
Number of Neutrons
98
34
78
99+
Number of Electrons
67
99+
55
99+
Radius of an Atom
Atomic Radius
176.00 pm
18
265.00 pm
1
Covalent Radius
192.00 pm
17
244.00 pm
2
Van der Waals Radius
216.00 pm
24
343.00 pm
2
Atomic Weight
164.93 amu
99+
132.91 amu
99+
Atomic Volume
18.70 cm3/mol
24
71.07 cm3/mol
1
Adjacent Atomic Numbers
Valence Electron Potential
47.90 (-eV)
31
8.62 (-eV)
99+
Lattice Constant
357.73 pm
38
614.10 pm
5
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.57
17
Not Available
Mechanical Properties
Density
Density At Room Temperature
8.79 g/cm3
99+
1.93 g/cm3
99+
Density When Liquid (at m.p.)
8.34 g/cm3
26
1.84 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
16
Not Available
Elasticity properties
Shear Modulus
26.30 GPa
28
Not Available
Bulk Modulus
40.20 GPa
32
1.60 GPa
99+
Young's Modulus
64.80 GPa
31
1.70 GPa
99+
Poisson Ratio
0.23
29
Not Available
Other Mechanical Properties
Ductile, Malleable, Sectile
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
8.80
35
1.87
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Semiconductor
Resistivity
814.00 nΩ·m
4
205.00 nΩ·m
17
Electrical Conductivity
0.01 106/cm Ω
99+
0.05 106/cm Ω
35
Electron Affinity
50.00 kJ/mol
21
45.50 kJ/mol
25
Thermal Properties
Specific Heat
0.16 J/(kg K)
35
0.24 J/(kg K)
23
Molar Heat Capacity
27.15 J/mol·K
19
32.21 J/mol·K
4
Thermal Conductivity
16.20 W/m·K
99+
35.90 W/m·K
36
Critical Temperature
Not Available
1,938.00 K
5
Thermal Expansion
11.20 µm/(m·K)
35
97.00 µm/(m·K)
1
Enthalpy
Enthalpy of Vaporization
241.00 kJ/mol
38
65.90 kJ/mol
99+
Enthalpy of Fusion
11.76 kJ/mol
29
2.10 kJ/mol
99+
Enthalpy of Atomization
301.00 kJ/mol
36
78.20 kJ/mol
99+
Standard Molar Entropy
75.30 J/mol.K
8
85.20 J/mol.K
3
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