Home
 Compare Metals

Americium vs Mendelevium

Americium
Mendelevium
Mendelevium vs Americium


Periodic Table
Symbol
Am  
Md  
Group Number
10  
8
3  
15
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
7440359  
99+
7440111  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
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).
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Obtained By Bombarding Plutonium with Neutrons  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso  
Lawrence Berkeley National Laboratory  
Discovery
In 1944  
In 1955  
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
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 Mendelevium 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+
827.00 °C  
99+
Boiling Point
2,607.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
-  
Brinell Hardness
260.00 MPa  
99+
350.00 MPa  
36
Vickers Hardness
600.00 MPa  
28
0.00 MPa  
99+
Speed of Sound
2,750.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
64.00 %  
19
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Am  
Md  
Isotopes
  
  
Known Isotopes
16  
23
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.20  
28
1.20  
28
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
1.30  
40
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.70  
22
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
99+
2nd Energy Level
1,158.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
2,132.00 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
3,493.00 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
7th Energy level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
10th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
11th Energy Level
5,780.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
62,400.00 kJ/mol  
11
60,100.00 kJ/mol  
16
13th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
37
14th Energy Level
5,780.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
62,400.00 kJ/mol  
39
63,500.00 kJ/mol  
37
16th Energy Level
57,800.00 kJ/mol  
99+
635.00 kJ/mol  
99+
17th Energy Level
578.00 kJ/mol  
99+
1,107.00 kJ/mol  
21
18th Energy Level
5,780.00 kJ/mol  
99+
6,350.00 kJ/mol  
39
19th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
99+
20th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
40
21st Energy Level
5,780.00 kJ/mol  
22
6,350.00 kJ/mol  
13
22nd Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
5,780.00 kJ/mol  
23
6,350.00 kJ/mol  
13
24th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
36
25th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
38
26th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
37
27th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
39
28th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
99+
29th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
99+
30th Energy Level
578.00 kJ/mol  
99+
635.00 kJ/mol  
40
Electrochemical Equivalent
3.02 g/amp-hr  
20
3.21 g/amp-hr  
13
Electron Work Function
4.30 eV  
25
3.89 eV  
37
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
95  
23
101  
17
Electron Configuration
[Rn] 5f7 7s2  
[Rn] 5f13 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Not Known  
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
95  
23
101  
17
Number of Neutrons
148  
13
157  
8
Number of Electrons
95  
23
101  
17
Radius of an Atom
  
  
Atomic Radius
173.00 pm  
23
175.00 pm  
21
Covalent Radius
180.00 pm  
23
175.00 pm  
25
Van der Waals Radius
244.00 pm  
14
246.00 pm  
12
Atomic Weight
243.00 amu  
20
258.00 amu  
14
Atomic Volume
17.86 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Fermium
  
Next Element
Curium
  
Nobelium
  
Valence Electron Potential
44.00 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
346.81 pm  
99+
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.58  
34
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
12.00 g/cm3  
32
10.30 g/cm3  
38
Density When Liquid (at m.p.)
13.67 g/cm3  
26
10.30 g/cm3  
39
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
32.00 GPa  
24
Bulk Modulus
44.00 GPa  
32
0.00 GPa  
99+
Young's Modulus
58.00 GPa  
36
12.00 GPa  
99+
Poisson Ratio
0.30  
14
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.67  
26
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
16
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.69 nΩ·m  
99+
0.63 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+
1,100.00 K  
99+
Thermal Expansion
13.60 µm/(m·K)  
32
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
161.00 kJ/mol  
99+
380.50 kJ/mol  
26
Enthalpy of Fusion
14.39 kJ/mol  
27
-  
Enthalpy of Atomization
268.00 kJ/mol  
99+
410.80 kJ/mol  
25
Standard Molar Entropy
63.10 J/mol.K  
23
37.40 J/mol.K  
99+
Periodic Table >>
<< All

Compare Actinide Series

Actinide Series

Actinide Series

» More Actinide Series

Compare Actinide Series

» More Compare Actinide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!