Lutetium Actinium Comparison
Periodic Table
Symbol
Lu
Ac
Group Number
Not Available
Not Available
Period Number
6
7
Block
f block
f block
Element Family
Lanthanide
Actinide
CAS Number
7439943
99+
7440348
99+
Space Group Name
P63/mmc
Fm_ 3m
Space Group Number
194.00
5
225.00
2
Facts
Interesting Facts
- Metal dust of Lutetium element is highly explosive.
- Lutetium metal is corrosion resistance and acts stable in air.
Not Available
Sources
Found in Minerals, Mining, Ores of Minerals
Obtained by Treating Radium with Neutrons, Ores of metals
History
Who Discovered
Georges Urbain and Carl Auer von Welsbach
Friedrich Oskar Giesel
Discovery
In 1906
In 1902
Abundance
Abundance In Universe
1 * 10-8 %
30
Not Available
Abundance In Sun
~0.0000001 %
26
~-9999 %
Abundance In Meteorites
0.00 %
99+
Not Available
Abundance In Earth's Crust
0.00 %
99+
Not Available
Abundance In Oceans
0.00 %
99+
Not Available
Uses
Uses & Benefits
- Lutetium metal is used outside research. It has commercial uses like Industrial catalyst for cracking oil refineries of hydrocarbons .
- Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Alloys
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Low Toxic
Toxic
Present in Human Body
No
No
In Blood
Not Available
0.00 Blood/mg dm-3
37
In Bone
Not Available
0.00 p.p.m.
36
Physical Properties
Melting Point
1,652.00 °C
19
1,227.00 °C
38
Boiling Point
3,402.00 °C
19
3,200.00 °C
26
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery White
Luster
Metallic
NA
Hardness
Brinell Hardness
893.00 MPa
10
Not Available
Vickers Hardness
1,160.00 MPa
8
Not Available
Speed of Sound
Not Available
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
Lu
Ac
Isotopes
Known Isotopes
35
4
29
10
Electronegativity
Pauling Electronegativity
1.27
34
1.10
99+
Allred Rochow Electronegativity
1.14
28
1.00
36
Electropositivity
Pauling Electropositivity
2.73
20
2.90
10
Ionization Energies
1st Energy Level
523.50 kJ/mol
99+
499.00 kJ/mol
99+
2nd Energy Level
1,340.00 kJ/mol
99+
1,170.00 kJ/mol
99+
3rd Energy Level
2,022.30 kJ/mol
99+
1,900.00 kJ/mol
99+
4th Energy Level
4,370.00 kJ/mol
28
4,700.00 kJ/mol
23
5th Energy Level
6,445.00 kJ/mol
21
Not Available
Electrochemical Equivalent
2.18 g/amp-hr
23
2.82 g/amp-hr
18
Electron Work Function
3.30 eV
33
Not Available
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
71
99+
89
29
Electron Configuration
[Xe] 6s2 4f14 5d1
[Rn] 6d1 7s2
Crystal Structure
Hexagonal Close Packed (HCP)
Face Centered Cubic (FCC)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
FCC-Crystal-Structure-of-Actinium.jpg#100
Atom
Number of Protons
71
99+
89
29
Number of Neutrons
104
30
138
16
Number of Electrons
71
99+
89
29
Radius of an Atom
Atomic Radius
174.00 pm
20
195.00 pm
7
Covalent Radius
187.00 pm
20
Not Available
Van der Waals Radius
221.00 pm
22
Not Available
Atomic Weight
174.97 amu
40
227.00 amu
25
Atomic Volume
17.78 cm3/mol
30
22.54 cm3/mol
11
Adjacent Atomic Numbers
Valence Electron Potential
50.90 (-eV)
26
38.60 (-eV)
99+
Lattice Constant
350.31 pm
99+
567.00 pm
8
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.59
10
Not Available
Mechanical Properties
Density
Density At Room Temperature
9.84 g/cm3
38
10.00 g/cm3
37
Density When Liquid (at m.p.)
9.30 g/cm3
22
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
33
Not Available
Vapor Pressure at 2000 K
3.18 (Pa)
11
Not Available
Elasticity properties
Shear Modulus
27.20 GPa
26
Not Available
Bulk Modulus
47.60 GPa
23
Not Available
Young's Modulus
68.60 GPa
30
Not Available
Poisson Ratio
0.26
21
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
9.84
29
10.07
28
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Unknown
Resistivity
582.00 nΩ·m
9
Not Available
Electrical Conductivity
0.02 106/cm Ω
99+
Not Available
Electron Affinity
50.00 kJ/mol
21
Not Available
Thermal Properties
Specific Heat
0.15 J/(kg K)
36
0.12 J/(kg K)
40
Molar Heat Capacity
26.86 J/mol·K
24
27.20 J/mol·K
18
Thermal Conductivity
16.40 W/m·K
99+
12.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
9.90 µm/(m·K)
40
Not Available
Enthalpy
Enthalpy of Vaporization
355.90 kJ/mol
22
Not Available
Enthalpy of Fusion
18.70 kJ/mol
13
Not Available
Enthalpy of Atomization
398.00 kJ/mol
20
301.00 kJ/mol
36
Standard Molar Entropy
51.00 J/mol.K
30
56.50 J/mol.K
25
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