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Actinium Holmium Comparison

Actinium
Holmium
Holmium Actinium comparison


Periodic Table
Symbol
Ac   
Ho   
Group Number
Not Available   
Not Available   
Period Number
7   
6   
Block
f block   
f block   
Element Family
Actinide   
Lanthanide   
CAS Number
7440348   
99+
7440600   
29
Space Group Name
Fm_ 3m   
P63/mmc   
Space Group Number
225.00   
2
194.00   
5
Facts
Interesting Facts
Not Available   
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
Sources
Obtained by Treating Radium with Neutrons, Ores of metals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Friedrich Oskar Giesel   
Marc Delafontaine   
Discovery
In 1902   
In 1878   
Abundance
  
  
Abundance In Universe
Not Available   
5 * 10-8 %   
27
Abundance In Meteorites
Not Available   
0.00 %   
99+
Abundance In Earth's Crust
Not Available   
0.00 %   
38
Abundance In Oceans
Not Available   
0.00 %   
99+
Uses
Uses & Benefits
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
  • 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.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, Nuclear Research   
Biological Properties
  
  
Toxicity
Toxic   
Low Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
1,227.00 °C   
38
1,461.00 °C   
30
Boiling Point
3,200.00 °C   
26
2,600.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Brinell Hardness
Not Available   
746.00 MPa   
13
Vickers Hardness
Not Available   
481.00 MPa   
23
Speed of Sound
Not Available   
2,760.00 m/s   
30
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
Ac   
Ho   
Isotopes
  
  
Known Isotopes
29   
10
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.10   
99+
1.23   
37
Allred Rochow Electronegativity
1.00   
36
1.10   
30
Electropositivity
  
  
Pauling Electropositivity
2.90   
10
2.77   
17
Ionization Energies
  
  
1st Energy Level
499.00 kJ/mol   
99+
581.00 kJ/mol   
99+
2nd Energy Level
1,170.00 kJ/mol   
99+
1,140.00 kJ/mol   
99+
3rd Energy Level
1,900.00 kJ/mol   
99+
2,204.00 kJ/mol   
99+
4th Energy Level
4,700.00 kJ/mol   
23
4,100.00 kJ/mol   
34
Electrochemical Equivalent
2.82 g/amp-hr   
18
2.02 g/amp-hr   
29
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
89   
29
67   
99+
Electron Configuration
[Rn] 6d1 7s2   
[Xe] 4f11 6s2   
Crystal Structure
Face Centered Cubic (FCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100   
HCP-Crystal-Structure-of-Holmium.jpg#100   
Atom
  
  
Number of Protons
89   
29
67   
99+
Number of Neutrons
138   
16
98   
34
Number of Electrons
89   
29
67   
99+
Radius of an Atom
  
  
Atomic Radius
195.00 pm   
7
176.00 pm   
18
Covalent Radius
Not Available   
192.00 pm   
17
Van der Waals Radius
Not Available   
216.00 pm   
24
Atomic Weight
227.00 amu   
25
164.93 amu   
99+
Atomic Volume
22.54 cm3/mol   
11
18.70 cm3/mol   
24
Adjacent Atomic Numbers
  
  
Previous Element
Radium
  
Dysprosium
  
Next Element
Thorium
  
Erbium
  
Valence Electron Potential
38.60 (-eV)   
99+
47.90 (-eV)   
31
Lattice Constant
567.00 pm   
8
357.73 pm   
38
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.57   
17
Mechanical Properties
Density
  
  
Density At Room Temperature
10.00 g/cm3   
37
8.79 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
8.34 g/cm3   
26
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
16
Elasticity properties
  
  
Shear Modulus
Not Available   
26.30 GPa   
28
Bulk Modulus
Not Available   
40.20 GPa   
32
Young's Modulus
Not Available   
64.80 GPa   
31
Poisson Ratio
Not Available   
0.23   
29
Other Mechanical Properties
NA   
Ductile, Malleable, Sectile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
10.07   
28
8.80   
35
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
814.00 nΩ·m   
4
Electrical Conductivity
Not Available   
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.16 J/(kg K)   
35
Molar Heat Capacity
27.20 J/mol·K   
18
27.15 J/mol·K   
19
Thermal Conductivity
12.00 W/m·K   
99+
16.20 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
11.20 µm/(m·K)   
35
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
241.00 kJ/mol   
38
Enthalpy of Fusion
Not Available   
11.76 kJ/mol   
29
Enthalpy of Atomization
301.00 kJ/mol   
36
301.00 kJ/mol   
36
Standard Molar Entropy
56.50 J/mol.K   
25
75.30 J/mol.K   
8
Summary >>
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