Curium Ytterbium Comparison
Periodic Table
Symbol
Cm
Yb
Group Number
Not Available
Not Available
Period Number
7
6
Block
f block
f block
Element Family
Actinide
Lanthanide
CAS Number
7440519
36
7440644
26
Space Group Name
Not Available
Fm_ 3m
Space Group Number
Not Available
225.00
2
Facts
Interesting Facts
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
- Ytterbium metal oxidizes rapidly if exposed to air.
- Ytterbium metal can dissolve quickly in Mineral acid.
Sources
Bombarding Plutonium with Helium Ions
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Jean Charles Galissard de Marignac
Discovery
In 1944
In 1878
Abundance
Abundance In Universe
Not Available
2 * 10-7 %
22
Abundance In Sun
~-9999 %
~0.0000001 %
26
Abundance In Meteorites
Not Available
0.00 %
36
Abundance In Earth's Crust
Not Available
0.00 %
33
Abundance In Oceans
Not Available
0.00 %
37
Uses
Uses & Benefits
- Curium metal is used to provide power to electrical equipment for space missions.
- Ytterbium metal is used in memory devices and tuneable laser.
- It is also used as industrial catalyst as the other catalysts are too toxic and polluting.
Industrial Uses
NA
Automobile Industry, Chemical Industry
Medical Uses
NA
NA
Other Uses
Research Purposes
Alloys
Biological Properties
Toxicity
Unknown
Highly 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
824.00 °C
99+
Boiling Point
3,110.00 °C
30
1,196.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silver
Silvery White
Luster
Metallic
Metallic
Hardness
Brinell Hardness
Not Available
343.00 MPa
31
Vickers Hardness
Not Available
206.00 MPa
33
Speed of Sound
Not Available
1,590.00 m/s
99+
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
Yb
Isotopes
Known Isotopes
15
24
30
9
Electronegativity
Pauling Electronegativity
1.30
32
Not Available
Allred Rochow Electronegativity
1.20
27
1.06
33
Electropositivity
Pauling Electropositivity
2.70
22
Not Available
Ionization Energies
1st Energy Level
581.00 kJ/mol
99+
603.40 kJ/mol
99+
2nd Energy Level
1,196.00 kJ/mol
99+
1,174.80 kJ/mol
99+
3rd Energy Level
2,026.00 kJ/mol
99+
2,417.00 kJ/mol
99+
4th Energy Level
3,550.00 kJ/mol
99+
4,203.00 kJ/mol
31
Electrochemical Equivalent
3.07 g/amp-hr
16
2.15 g/amp-hr
25
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
96
22
70
99+
Electron Configuration
[Rn] 5f7 6d1 7s2
[Xe] 4f14 6s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Face Centered Cubic (FCC)
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100
FCC-Crystal-Structure-of-Ytterbium.jpg#100
Atom
Number of Protons
96
22
70
99+
Number of Neutrons
151
10
103
31
Number of Electrons
96
22
70
99+
Radius of an Atom
Atomic Radius
174.00 pm
20
176.00 pm
18
Covalent Radius
169.00 pm
26
187.00 pm
20
Van der Waals Radius
200.00 pm
28
242.00 pm
12
Atomic Weight
247.00 amu
18
173.05 amu
99+
Atomic Volume
18.28 cm3/mol
26
24.79 cm3/mol
9
Adjacent Atomic Numbers
Valence Electron Potential
44.50 (-eV)
38
50.30 (-eV)
27
Lattice Constant
Not Available
548.47 pm
11
Lattice Angles
NA
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
13.51 g/cm3
25
6.90 g/cm3
99+
Density When Liquid (at m.p.)
13.85 g/cm3
10
6.21 g/cm3
99+
Tensile Strength
Not Available
58.00 MPa
18
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
Not Available
9.90 GPa
99+
Bulk Modulus
Not Available
30.50 GPa
39
Young's Modulus
Not Available
23.90 GPa
99+
Poisson Ratio
Not Available
0.21
33
Other Mechanical Properties
Unknown
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.51
17
6.97
99+
Magnetic Ordering
Antiferromagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
1.25 nΩ·m
99+
0.25 nΩ·m
99+
Electrical Conductivity
Not Available
0.04 106/cm Ω
38
Electron Affinity
Not Available
50.00 kJ/mol
21
Thermal Properties
Specific Heat
Not Available
0.15 J/(kg K)
36
Molar Heat Capacity
Not Available
26.74 J/mol·K
25
Thermal Conductivity
Not Available
38.50 W/m·K
35
Critical Temperature
Not Available
26.30 K
7
Thermal Expansion
Not Available
26.30 µm/(m·K)
14
Enthalpy
Enthalpy of Vaporization
Not Available
128.90 kJ/mol
99+
Enthalpy of Fusion
15.00 kJ/mol
21
7.66 kJ/mol
99+
Enthalpy of Atomization
Not Available
180.00 kJ/mol
99+
Standard Molar Entropy
Not Available
59.90 J/mol.K
21
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