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Americium vs Meitnerium

Americium
Meitnerium
Meitnerium vs Americium


Periodic Table
Symbol
Am  
Mt  
Group Number
10  
8
9  
9
Period Number
7  
7  
Block
f block  
d block  
Element Family
Actinide  
Probably Transition  
CAS Number
7440359  
99+
54038016  
10
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
166.00  
9
Facts
Interesting Facts
  • Americium metal is produced by bombarding Plutonium with Neutrons.
  • Americium metal was discovered as a by-product while testing an atomic bomb (Manhattan Project).
  
Meitnerium is named after Lise Meitner, an Austrian physicist.  
Sources
Obtained By Bombarding Plutonium with Neutrons  
Bombarding Bi209 with Accelerated Nuclei of Fe58, Synthetically Produced  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, 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
  • Americium metal is used in smoke detection alarms.
  • In the future, this metal has a potential to be used in batteries of spacecrafts.
  
  • Currently known uses of Meitnerium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
-  
Biological Properties
  
  
Toxicity
Toxic  
-  
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
994.00 °C  
99+
-  
Boiling Point
2,607.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
-  
Unknown Luster  
Hardness
  
  
Mohs Hardness
6.00  
6
-  
Brinell Hardness
260.00 MPa  
99+
400.00 MPa  
34
Vickers Hardness
600.00 MPa  
28
350.00 MPa  
99+
Speed of Sound
2,750.00 m/s  
99+
3,200.00 m/s  
35
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
64.00 %  
19
68.00 %  
15
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Am  
Mt  
Isotopes
  
  
Known Isotopes
16  
23
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
578.00 kJ/mol  
99+
800.80 kJ/mol  
15
2nd Energy Level
1,158.00 kJ/mol  
99+
1,823.60 kJ/mol  
18
3rd Energy Level
2,132.00 kJ/mol  
99+
2,904.20 kJ/mol  
31
4th Energy Level
3,493.00 kJ/mol  
99+
3,859.40 kJ/mol  
99+
5th Energy Level
5,780.00 kJ/mol  
99+
4,920.80 kJ/mol  
99+
6th Energy Level
5,780.00 kJ/mol  
99+
8,000.00 kJ/mol  
34
7th Energy level
5,780.00 kJ/mol  
99+
8,000.00 kJ/mol  
28
8th Energy Level
5,780.00 kJ/mol  
99+
8,000.00 kJ/mol  
28
9th Energy Level
5,780.00 kJ/mol  
99+
6,700.00 kJ/mol  
36
10th Energy Level
5,780.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
11th Energy Level
5,780.00 kJ/mol  
99+
6,300.00 kJ/mol  
99+
12th Energy Level
62,400.00 kJ/mol  
11
0.00 kJ/mol  
99+
13th Energy Level
5,780.00 kJ/mol  
99+
8,000.00 kJ/mol  
20
14th Energy Level
5,780.00 kJ/mol  
99+
1,156.00 kJ/mol  
99+
15th Energy Level
62,400.00 kJ/mol  
39
80,000.00 kJ/mol  
17
16th Energy Level
57,800.00 kJ/mol  
99+
58,700.00 kJ/mol  
39
17th Energy Level
578.00 kJ/mol  
99+
1,110.00 kJ/mol  
20
18th Energy Level
5,780.00 kJ/mol  
99+
8,000.00 kJ/mol  
23
19th Energy Level
578.00 kJ/mol  
99+
1,110.00 kJ/mol  
17
20th Energy Level
578.00 kJ/mol  
99+
850.00 kJ/mol  
18
21st Energy Level
5,780.00 kJ/mol  
22
800.00 kJ/mol  
99+
22nd Energy Level
578.00 kJ/mol  
99+
380.00 kJ/mol  
99+
23rd Energy Level
5,780.00 kJ/mol  
23
8,000.00 kJ/mol  
9
24th Energy Level
578.00 kJ/mol  
99+
565.60 kJ/mol  
99+
25th Energy Level
578.00 kJ/mol  
99+
800.00 kJ/mol  
13
26th Energy Level
578.00 kJ/mol  
99+
800.00 kJ/mol  
13
27th Energy Level
578.00 kJ/mol  
99+
800.00 kJ/mol  
12
28th Energy Level
578.00 kJ/mol  
99+
800.00 kJ/mol  
18
29th Energy Level
578.00 kJ/mol  
99+
800.00 kJ/mol  
18
30th Energy Level
578.00 kJ/mol  
99+
800.00 kJ/mol  
13
Electrochemical Equivalent
3.02 g/amp-hr  
20
3.00 g/amp-hr  
21
Electron Work Function
4.30 eV  
25
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
95  
23
109  
9
Electron Configuration
[Rn] 5f7 7s2  
[Rn] 5f14 6d7 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100  
FCC-Crystal-Structure-of-Meitnerium.jpg#100  
Atom
  
  
Number of Protons
95  
23
109  
9
Number of Neutrons
148  
13
157  
8
Number of Electrons
95  
23
109  
9
Radius of an Atom
  
  
Atomic Radius
173.00 pm  
23
122.00 pm  
99+
Covalent Radius
180.00 pm  
23
129.00 pm  
99+
Van der Waals Radius
244.00 pm  
14
260.00 pm  
9
Atomic Weight
243.00 amu  
20
278.00 amu  
7
Atomic Volume
17.86 cm3/mol  
99+
20.20 cm3/mol  
30
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Hassium
  
Next Element
Curium
  
Darmstadtium
  
Valence Electron Potential
44.00 (-eV)  
99+
31.20 (-eV)  
99+
Lattice Constant
346.81 pm  
99+
0.00 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.58  
34
1.59  
27
Mechanical
Density
  
  
Density At Room Temperature
12.00 g/cm3  
32
37.40 g/cm3  
2
Density When Liquid (at m.p.)
13.67 g/cm3  
26
37.40 g/cm3  
2
Tensile Strength
80.00 MPa  
29
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
13
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
26.00 GPa  
36
35.00 GPa  
21
Bulk Modulus
44.00 GPa  
32
0.00 GPa  
99+
Young's Modulus
58.00 GPa  
36
13.50 GPa  
99+
Poisson Ratio
0.30  
14
0.25  
24
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.67  
26
37.40  
4
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
12
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.69 nΩ·m  
99+
0.35 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
63.90 kJ/mol  
18
50.00 kJ/mol  
26
Thermal
Specific Heat
0.11 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
62.70 J/mol·K  
1
27.00 J/mol·K  
29
Thermal Conductivity
10.00 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,449.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
13.60 µm/(m·K)  
32
10.30 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
161.00 kJ/mol  
99+
110.00 kJ/mol  
99+
Enthalpy of Fusion
14.39 kJ/mol  
27
-  
Enthalpy of Atomization
268.00 kJ/mol  
99+
350.20 kJ/mol  
37
Standard Molar Entropy
63.10 J/mol.K  
23
63.80 J/mol.K  
22
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