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Actinium Samarium Comparison

Actinium
Samarium
Samarium Actinium comparison


Periodic Table
Symbol
Ac  
Sm  
Group Number
3  
15
3  
15
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440348  
99+
7440199  
99+
Space Group Name
Fm_ 3m  
R_ 3m  
Space Group Number
225.00  
3
166.00  
9
Facts
Interesting Facts
Actinium glows in the dark due to its radioactivity.  
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
Sources
Obtained by Treating Radium with Neutrons, Ores of metals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Friedrich Oskar Giesel  
Lecoq de Boisbaudran  
Discovery
In 1902  
In 1879  
Abundance
  
  
Abundance In Universe
0.00 %  
34
0.00 %  
20
Abundance In Sun
0.00 %  
26
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
37
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
29
Abundance In Oceans
0.00 %  
99+
0.00 %  
40
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
  • Magnets of Samarium cobalt alloy are stronger than that of Iron and hence, they are used in microwave application.
  • Samarium metal also used in optical lasers and infrared absorbing glasses and as a neutron absorber.
  
Industrial Uses
-  
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys, In Nuclear Reactors  
Biological Properties
  
  
Toxicity
Toxic  
Slightly Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.01 Blood/mg dm-3  
22
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,227.00 °C  
38
1,072.00 °C  
99+
Boiling Point
3,200.00 °C  
27
1,900.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
-  
Lustrous  
Hardness
  
  
Mohs Hardness
6.50  
5
5.50  
7
Brinell Hardness
70.00 MPa  
99+
441.00 MPa  
32
Vickers Hardness
260.00 MPa  
99+
412.00 MPa  
40
Speed of Sound
3,430.00 m/s  
32
2,130.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.00  
99+
1.80  
22
Reflectivity
62.00 %  
21
65.00 %  
18
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ac  
Sm  
Isotopes
  
  
Known Isotopes
29  
10
30  
9
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.17  
99+
Sanderson Electronegativity
1.10  
38
1.17  
33
Allred Rochow Electronegativity
1.00  
37
1.07  
33
Mulliken-Jaffe Electronegativity
1.10  
99+
1.17  
40
Allen Electronegativity
1.10  
99+
1.17  
99+
Electropositivity
  
  
Pauling Electropositivity
2.90  
10
2.83  
14
Ionization Energies
  
  
1st Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
2nd Energy Level
1,170.00 kJ/mol  
99+
1,070.00 kJ/mol  
99+
3rd Energy Level
1,900.00 kJ/mol  
99+
2,260.00 kJ/mol  
99+
4th Energy Level
4,700.00 kJ/mol  
33
3,990.00 kJ/mol  
99+
5th Energy Level
4,990.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
6th Energy Level
5,750.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
7th Energy level
5,750.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
8th Energy Level
5,750.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
9th Energy Level
4,990.00 kJ/mol  
99+
5,440.00 kJ/mol  
99+
10th Energy Level
4,990.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
11th Energy Level
4,990.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
12th Energy Level
49,900.00 kJ/mol  
21
5,440.00 kJ/mol  
99+
13th Energy Level
4,990.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
14th Energy Level
4,990.00 kJ/mol  
99+
5,450.00 kJ/mol  
99+
15th Energy Level
49,900.00 kJ/mol  
99+
54,450.00 kJ/mol  
99+
16th Energy Level
49,900.00 kJ/mol  
99+
54,400.00 kJ/mol  
99+
17th Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
18th Energy Level
4,990.00 kJ/mol  
99+
5,445.00 kJ/mol  
99+
19th Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
20th Energy Level
499.00 kJ/mol  
99+
624.00 kJ/mol  
99+
21st Energy Level
4,990.00 kJ/mol  
25
544.50 kJ/mol  
99+
22nd Energy Level
499.00 kJ/mol  
99+
624.00 kJ/mol  
37
23rd Energy Level
4,990.00 kJ/mol  
29
544.50 kJ/mol  
99+
24th Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
25th Energy Level
499.00 kJ/mol  
99+
544.00 kJ/mol  
99+
26th Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
27th Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
28th Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
29th Energy Level
499.00 kJ/mol  
99+
544.50 kJ/mol  
99+
30th Energy Level
499.00 kJ/mol  
99+
544.00 kJ/mol  
99+
Electrochemical Equivalent
2.82 g/amp-hr  
22
1.87 g/amp-hr  
38
Electron Work Function
4.38 eV  
23
2.70 eV  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
89  
29
62  
99+
Electron Configuration
[Rn] 6d1 7s2  
[Xe] 4f6 6s2  
Crystal Structure
Face Centered Cubic (FCC)  
Rhombohedral (RHO)  
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100  
RHO-Crystal-Structure-of-Samarium.jpg#100  
Atom
  
  
Number of Protons
89  
29
62  
99+
Number of Neutrons
138  
17
88  
40
Number of Electrons
89  
29
62  
99+
Radius of an Atom
  
  
Atomic Radius
195.00 pm  
9
180.00 pm  
16
Covalent Radius
186.00 pm  
21
198.00 pm  
13
Van der Waals Radius
215.00 pm  
31
229.00 pm  
25
Atomic Weight
227.00 amu  
25
150.36 amu  
99+
Atomic Volume
22.54 cm3/mol  
20
19.95 cm3/mol  
31
Adjacent Atomic Numbers
  
  
Previous Element
Radium
  
Promethium
  
Next Element
Thorium
  
Europium
  
Valence Electron Potential
38.60 (-eV)  
99+
44.80 (-eV)  
38
Lattice Constant
567.00 pm  
9
362.10 pm  
37
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.89  
2
1.62  
15
Mechanical
Density
  
  
Density At Room Temperature
10.00 g/cm3  
40
7.52 g/cm3  
99+
Density When Liquid (at m.p.)
10.07 g/cm3  
40
7.16 g/cm3  
99+
Tensile Strength
65.00 MPa  
33
50.00 MPa  
38
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.94 (Pa)  
9
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
29
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
19.50 GPa  
99+
Bulk Modulus
94.00 GPa  
17
37.80 GPa  
99+
Young's Modulus
130.00 GPa  
16
49.70 GPa  
40
Poisson Ratio
0.34  
10
0.27  
19
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.07  
99+
7.52  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
9
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
5.20 nΩ·m  
99+
0.94 nΩ·m  
99+
Electrical Conductivity
0.15 106/cm Ω  
13
0.01 106/cm Ω  
99+
Electron Affinity
33.20 kJ/mol  
34
50.00 kJ/mol  
26
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.20 J/(kg K)  
32
Molar Heat Capacity
27.20 J/mol·K  
24
29.54 J/mol·K  
9
Thermal Conductivity
12.00 W/m·K  
99+
13.30 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,345.00 K  
99+
Thermal Expansion
12.10 µm/(m·K)  
99+
12.70 µm/(m·K)  
39
Enthalpy
  
  
Enthalpy of Vaporization
120.00 kJ/mol  
99+
166.40 kJ/mol  
99+
Enthalpy of Fusion
14.20 kJ/mol  
28
8.62 kJ/mol  
99+
Enthalpy of Atomization
301.00 kJ/mol  
99+
209.00 kJ/mol  
99+
Standard Molar Entropy
56.50 J/mol.K  
33
69.60 J/mol.K  
15
Summary >>
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Actinide Series

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