Symbol
Am
  
Co
  
Group Number
Not Available
  
Period Number
7
  
4
  
Block
f block
  
d block
  
Element Family
Actinide
  
Transition Metal
  
Space Group Name
P63/mmc
  
P63/mmc
  
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).
  
- The main source of Cobalt is as a by-product of copper and nickel metal mining.
- Cobalt metal can be obtained from other elements like Oxygen, Sulfur and Arsenic.
- It s also used in electroplating process as it exhibits anti cession properties.
  
Sources
Obtained By Bombarding Plutonium with Neutrons
  
Found in Compounds, Mining, Ores of Minerals
  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso
  
Georg Brandt
  
Discovery
In 1944
  
In 1732
  
Abundance
  
  
Abundance In Universe
Not Available
  
Abundance In Sun
~-9999 %
  
Abundance In Meteorites
Not Available
  
Abundance In Earth's Crust
Not Available
  
Abundance In Oceans
Not Available
  
Abundance In Humans
Not Available
  
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.
  
- Its alloys with aluminum and nickel are used to make powerful magnets.
-
Few other alloys exhibit high-temperature strength and hence they are used in Turbines of Jet and Gas engine.
  
Industrial Uses
NA
  
Chemical Industry, Electrical Industry, Electronic Industry
  
Medical Uses
NA
  
Pharmaceutical Industry
  
Other Uses
Alloys, Nuclear Research, Research Purposes
  
Alloys
  
Biological Properties
  
  
Toxicity
Toxic
  
Toxic
  
Present in Human Body
No
  
Yes
  
In Blood
0.00 Blood/mg dm-3
  
37
0.04 Blood/mg dm-3
  
18
In Bone
0.00 p.p.m.
  
36
0.04 p.p.m.
  
27
Melting Point
1,495.00 °C
  
29
Boiling Point
2,607.00 °C
  
99+
2,870.00 °C
  
34
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Gray
  
Luster
NA
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
1,043.00 MPa
  
11
Speed of Sound
Not Available
  
4,720.00 m/s
  
14
Optical Properties
  
  
Reflectivity
Not Available
  
Allotropes
No
  
Yes
  
α Allotropes
Not Available
  
α-Cobalt
  
β Allotropes
Not Available
  
β-Cobalt
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Am
  
Co
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol
  
99+
760.40 kJ/mol
  
19
2nd Energy Level
1,158.00 kJ/mol
  
99+
1,648.00 kJ/mol
  
31
3rd Energy Level
2,132.00 kJ/mol
  
99+
3,232.00 kJ/mol
  
22
4th Energy Level
3,493.00 kJ/mol
  
99+
4,950.00 kJ/mol
  
19
5th Energy Level
Not Available
  
7,670.00 kJ/mol
  
12
6th Energy Level
Not Available
  
9,840.00 kJ/mol
  
12
7th Energy level
Not Available
  
12,440.00 kJ/mol
  
11
8th Energy Level
Not Available
  
15,230.00 kJ/mol
  
12
9th Energy Level
Not Available
  
17,959.00 kJ/mol
  
13
10th Energy Level
Not Available
  
26,570.00 kJ/mol
  
7
11th Energy Level
Not Available
  
29,400.00 kJ/mol
  
8
12th Energy Level
Not Available
  
32,400.00 kJ/mol
  
8
13th Energy Level
Not Available
  
36,600.00 kJ/mol
  
8
14th Energy Level
Not Available
  
39,700.00 kJ/mol
  
9
15th Energy Level
Not Available
  
42,800.00 kJ/mol
  
12
16th Energy Level
Not Available
  
49,396.00 kJ/mol
  
11
17th Energy Level
Not Available
  
52,737.00 kJ/mol
  
13
18th Energy Level
Not Available
  
134,810.00 kJ/mol
  
1
19th Energy Level
Not Available
  
145,170.00 kJ/mol
  
2
20th Energy Level
Not Available
  
154,700.00 kJ/mol
  
4
21st Energy Level
Not Available
  
167,400.00 kJ/mol
  
4
22nd Energy Level
Not Available
  
178,100.00 kJ/mol
  
3
23rd Energy Level
Not Available
  
189,300.00 kJ/mol
  
3
Electrochemical Equivalent
3.02 g/amp-hr
  
17
1.10 g/amp-hr
  
99+
Electron Work Function
Not Available
  
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Chemical Stability, Ionization
  
Electron Configuration
[Rn] 5f7 7s2
  
[Ar] 3d2 4s2
  
Crystal Structure
Double Hexagonal Close Packed (DHCP)
  
Hexagonal Close Packed (HCP)
  
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100
  
HCP-Crystal-Structure-of-Cobalt.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Volume
17.86 cm3/mol
  
29
10.64 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
44.00 (-eV)
  
40
95.20 (-eV)
  
10
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, 2 π/3
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
12.00 g/cm3
  
30
4.51 g/cm3
  
99+
Density When Liquid (at m.p.)
Not Available
  
4.11 g/cm3
  
99+
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
Ductile
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Paramagnetic
  
Electrical Properties
  
  
Electrical Property
Unknown
  
Poor Conductor
  
Resistivity
420.00 nΩ·m
  
12
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.02 106/cm Ω
  
99+
Electron Affinity
Not Available
  
7.60 kJ/mol
  
37
Specific Heat
0.11 J/(kg K)
  
99+
0.52 J/(kg K)
  
9
Molar Heat Capacity
62.70 J/mol·K
  
1
25.06 J/mol·K
  
99+
Thermal Conductivity
10.00 W/m·K
  
99+
21.90 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
Not Available
  
8.60 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
429.00 kJ/mol
  
15
Enthalpy of Fusion
14.39 kJ/mol
  
24
15.48 kJ/mol
  
19
Enthalpy of Atomization
268.00 kJ/mol
  
40
468.60 kJ/mol
  
15
Standard Molar Entropy
Not Available
  
27.30 J/mol.K
  
99+