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Curium vs Meitnerium

Curium
Meitnerium
Meitnerium vs Curium


Periodic Table
Symbol
Cm  
Mt  
Group Number
3  
15
9  
9
Period Number
7  
7  
Block
f block  
d block  
Element Family
Actinide  
Probably Transition  
CAS Number
7440519  
36
54038016  
10
Space Group Name
-  
-  
Space Group Number
225.00  
3
166.00  
9
Facts
Interesting Facts
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Meitnerium is named after Lise Meitner, an Austrian physicist.  
Sources
Bombarding Plutonium with Helium Ions  
Bombarding Bi209 with Accelerated Nuclei of Fe58, Synthetically Produced  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Gesellschaft für Schwerionenforschung  
Discovery
In 1944  
In 1982  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
0.00 %  
30
-  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Currently known uses of Meitnerium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
-  
Biological Properties
  
  
Toxicity
-  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,340.00 °C  
34
-  
Boiling Point
3,110.00 °C  
31
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
-  
Luster
Metallic  
Unknown Luster  
Hardness
  
  
Mohs Hardness
2.00  
17
-  
Brinell Hardness
320.00 MPa  
40
400.00 MPa  
34
Vickers Hardness
461.00 MPa  
37
350.00 MPa  
99+
Speed of Sound
2,260.00 m/s  
99+
3,200.00 m/s  
35
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
60.00 %  
23
68.00 %  
15
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cm  
Mt  
Isotopes
  
  
Known Isotopes
15  
24
4  
33
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.30  
33
Sanderson Electronegativity
1.30  
25
1.90  
13
Allred Rochow Electronegativity
1.20  
28
1.30  
25
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
1.30  
40
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.00  
99+
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol  
99+
800.80 kJ/mol  
15
2nd Energy Level
1,196.00 kJ/mol  
99+
1,823.60 kJ/mol  
18
3rd Energy Level
2,026.00 kJ/mol  
99+
2,904.20 kJ/mol  
31
4th Energy Level
3,550.00 kJ/mol  
99+
3,859.40 kJ/mol  
99+
5th Energy Level
5,810.00 kJ/mol  
99+
4,920.80 kJ/mol  
99+
6th Energy Level
5,810.00 kJ/mol  
99+
8,000.00 kJ/mol  
34
7th Energy level
5,810.00 kJ/mol  
99+
8,000.00 kJ/mol  
28
8th Energy Level
5,810.00 kJ/mol  
99+
8,000.00 kJ/mol  
28
9th Energy Level
6,690.00 kJ/mol  
37
6,700.00 kJ/mol  
36
10th Energy Level
5,810.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
11th Energy Level
5,810.00 kJ/mol  
99+
6,300.00 kJ/mol  
99+
12th Energy Level
58,100.00 kJ/mol  
19
0.00 kJ/mol  
99+
13th Energy Level
5,810.00 kJ/mol  
99+
8,000.00 kJ/mol  
20
14th Energy Level
5,810.00 kJ/mol  
40
1,156.00 kJ/mol  
99+
15th Energy Level
58,100.00 kJ/mol  
99+
80,000.00 kJ/mol  
17
16th Energy Level
58,100.00 kJ/mol  
99+
58,700.00 kJ/mol  
39
17th Energy Level
581.00 kJ/mol  
99+
1,110.00 kJ/mol  
20
18th Energy Level
5,810.00 kJ/mol  
99+
8,000.00 kJ/mol  
23
19th Energy Level
581.00 kJ/mol  
99+
1,110.00 kJ/mol  
17
20th Energy Level
581.00 kJ/mol  
99+
850.00 kJ/mol  
18
21st Energy Level
5,810.00 kJ/mol  
20
800.00 kJ/mol  
99+
22nd Energy Level
581.00 kJ/mol  
99+
380.00 kJ/mol  
99+
23rd Energy Level
5,810.00 kJ/mol  
20
8,000.00 kJ/mol  
9
24th Energy Level
581.00 kJ/mol  
99+
565.60 kJ/mol  
99+
25th Energy Level
581.00 kJ/mol  
99+
800.00 kJ/mol  
13
26th Energy Level
581.00 kJ/mol  
99+
800.00 kJ/mol  
13
27th Energy Level
581.00 kJ/mol  
99+
800.00 kJ/mol  
12
28th Energy Level
581.00 kJ/mol  
99+
800.00 kJ/mol  
18
29th Energy Level
581.00 kJ/mol  
99+
800.00 kJ/mol  
18
30th Energy Level
581.00 kJ/mol  
99+
800.00 kJ/mol  
13
Electrochemical Equivalent
3.07 g/amp-hr  
19
3.00 g/amp-hr  
21
Electron Work Function
4.50 eV  
19
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
96  
22
109  
9
Electron Configuration
[Rn] 5f7 6d1 7s2  
[Rn] 5f14 6d7 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100  
FCC-Crystal-Structure-of-Meitnerium.jpg#100  
Atom
  
  
Number of Protons
96  
22
109  
9
Number of Neutrons
151  
11
157  
8
Number of Electrons
96  
22
109  
9
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
22
122.00 pm  
99+
Covalent Radius
169.00 pm  
28
129.00 pm  
99+
Van der Waals Radius
200.00 pm  
35
260.00 pm  
9
Atomic Weight
247.00 amu  
18
278.00 amu  
7
Atomic Volume
18.28 cm3/mol  
38
20.20 cm3/mol  
30
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Hassium
  
Next Element
Berkelium
  
Darmstadtium
  
Valence Electron Potential
44.50 (-eV)  
39
31.20 (-eV)  
99+
Lattice Constant
336.25 pm  
99+
0.00 pm  
99+
Lattice Angles
-  
-  
Lattice C/A Ratio
1.67  
11
1.59  
27
Mechanical
Density
  
  
Density At Room Temperature
13.51 g/cm3  
26
37.40 g/cm3  
2
Density When Liquid (at m.p.)
13.85 g/cm3  
25
37.40 g/cm3  
2
Tensile Strength
350.00 MPa  
12
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
35.00 GPa  
21
Bulk Modulus
40.00 GPa  
38
0.00 GPa  
99+
Young's Modulus
0.00 GPa  
99+
13.50 GPa  
99+
Poisson Ratio
0.35  
9
0.25  
24
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.51  
28
37.40  
4
Magnetic Ordering
Antiferromagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
12
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
1.25 nΩ·m  
99+
0.35 nΩ·m  
99+
Electrical Conductivity
0.13 106/cm Ω  
19
0.00 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
27.50 J/mol·K  
21
27.00 J/mol·K  
29
Thermal Conductivity
11.00 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,340.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
11.60 µm/(m·K)  
99+
10.30 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
331.60 kJ/mol  
40
110.00 kJ/mol  
99+
Enthalpy of Fusion
15.00 kJ/mol  
22
-  
Enthalpy of Atomization
-  
350.20 kJ/mol  
37
Standard Molar Entropy
52.50 J/mol.K  
36
63.80 J/mol.K  
22
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