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Curium vs Holmium

Curium
Holmium
Holmium vs Curium


Periodic Table
Symbol
Cm  
Ho  
Group Number
Not Available  
Not Available  
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440519  
36
7440600  
29
Space Group Name
Not Available  
P63/mmc  
Space Group Number
Not Available  
194.00  
5
Facts
Interesting Facts
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
Sources
Bombarding Plutonium with Helium Ions  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Marc Delafontaine  
Discovery
In 1944  
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
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • 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
Research Purposes  
Alloys, Nuclear Research  
Biological Properties
  
  
Toxicity
Unknown  
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
1,340.00 °C  
34
1,461.00 °C  
30
Boiling Point
3,110.00 °C  
30
2,600.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery White  
Luster
Metallic  
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
Cm  
Ho  
Isotopes
  
  
Known Isotopes
15  
24
34  
5
Electronegativity
  
  
Pauling Electronegativity
1.30  
32
1.23  
37
Allred Rochow Electronegativity
1.20  
27
1.10  
30
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.77  
17
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol  
99+
581.00 kJ/mol  
99+
2nd Energy Level
1,196.00 kJ/mol  
99+
1,140.00 kJ/mol  
99+
3rd Energy Level
2,026.00 kJ/mol  
99+
2,204.00 kJ/mol  
99+
4th Energy Level
3,550.00 kJ/mol  
99+
4,100.00 kJ/mol  
34
Electrochemical Equivalent
3.07 g/amp-hr  
16
2.02 g/amp-hr  
29
Electron Work Function
Not Available  
Not Available  
Other Chemical Properties
Ionization, Radioactive Isotopes  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
96  
22
67  
99+
Electron Configuration
[Rn] 5f7 6d1 7s2  
[Xe] 4f11 6s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100  
HCP-Crystal-Structure-of-Holmium.jpg#100  
Atom
  
  
Number of Protons
96  
22
67  
99+
Number of Neutrons
151  
10
98  
34
Number of Electrons
96  
22
67  
99+
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
20
176.00 pm  
18
Covalent Radius
169.00 pm  
26
192.00 pm  
17
Van der Waals Radius
200.00 pm  
28
216.00 pm  
24
Atomic Weight
247.00 amu  
18
164.93 amu  
99+
Atomic Volume
18.28 cm3/mol  
26
18.70 cm3/mol  
24
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Dysprosium
  
Next Element
Berkelium
  
Erbium
  
Valence Electron Potential
44.50 (-eV)  
38
47.90 (-eV)  
31
Lattice Constant
Not Available  
357.73 pm  
38
Lattice Angles
NA  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
Not Available  
1.57  
17
Mechanical Properties
Density
  
  
Density At Room Temperature
13.51 g/cm3  
25
8.79 g/cm3  
99+
Density When Liquid (at m.p.)
13.85 g/cm3  
10
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
Unknown  
Ductile, Malleable, Sectile  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.51  
17
8.80  
35
Magnetic Ordering
Antiferromagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Unknown  
Conductor  
Resistivity
1.25 nΩ·m  
99+
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
Not Available  
0.16 J/(kg K)  
35
Molar Heat Capacity
Not Available  
27.15 J/mol·K  
19
Thermal Conductivity
Not Available  
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
15.00 kJ/mol  
21
11.76 kJ/mol  
29
Enthalpy of Atomization
Not Available  
301.00 kJ/mol  
36
Standard Molar Entropy
Not Available  
75.30 J/mol.K  
8
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