Symbol
Am
  
Pb
  
Group Number
Not Available
  
Period Number
7
  
6
  
Block
f block
  
p block
  
Element Family
Actinide
  
Post-Transition
  
Space Group Name
P63/mmc
  
Fm_ 3m
  
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).
  
- Galena mineral contains almost 87% of Lead metal in it, Galena is sulfide mineral.
- The best available source of Lead metal today is by recycling automobile batteries.
  
Sources
Obtained By Bombarding Plutonium with Neutrons
  
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals
  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso
  
Unknown
  
Discovery
In 1944
  
In Middle Easterns (7000 BCE)
  
Abundance
  
  
Abundance In Universe
Not Available
  
Abundance In Sun
~-9999 %
  
~0.000001 %
  
18
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.
  
- It is also used in insecticides, hair dyes and as an anti-knocking additive for petrol. But all these are banned by the government as Lead metal is known for detrimental to health.
  
Industrial Uses
NA
  
Chemical Industry, Electrical Industry, Electronic Industry
  
Medical Uses
NA
  
Surgical Instruments Manufacturing
  
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
0.21 Blood/mg dm-3
  
11
In Bone
0.00 p.p.m.
  
36
30.00 p.p.m.
  
10
Boiling Point
2,607.00 °C
  
99+
1,740.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Gray
  
Luster
NA
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Speed of Sound
Not Available
  
1,190.00 m/s
  
99+
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Am
  
Pb
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol
  
99+
715.60 kJ/mol
  
31
2nd Energy Level
1,158.00 kJ/mol
  
99+
1,450.50 kJ/mol
  
99+
3rd Energy Level
2,132.00 kJ/mol
  
99+
3,081.50 kJ/mol
  
23
4th Energy Level
3,493.00 kJ/mol
  
99+
4,083.00 kJ/mol
  
35
5th Energy Level
Not Available
  
6,640.00 kJ/mol
  
20
Electrochemical Equivalent
3.02 g/amp-hr
  
17
3.87 g/amp-hr
  
9
Electron Work Function
Not Available
  
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Anti Corrosion, Ionization, Radioactive Isotopes
  
Electron Configuration
[Rn] 5f7 7s2
  
[Xe] 4f14 5d10 6s2 6p2
  
Crystal Structure
Double Hexagonal Close Packed (DHCP)
  
Face Centered Cubic (FCC)
  
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100
  
FCC-Crystal-Structure-of-Lead.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Volume
17.86 cm3/mol
  
29
18.17 cm3/mol
  
27
Adjacent Atomic Numbers
  
  
Valence Electron Potential
44.00 (-eV)
  
40
24.20 (-eV)
  
99+
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
12.00 g/cm3
  
30
11.34 g/cm3
  
33
Density When Liquid (at m.p.)
Not Available
  
10.66 g/cm3
  
15
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
Ductile, Malleable
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Diamagnetic
  
Electrical Properties
  
  
Electrical Property
Unknown
  
Poor Conductor
  
Resistivity
208.00 nΩ·m
  
16
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.05 106/cm Ω
  
36
Electron Affinity
Not Available
  
35.10 kJ/mol
  
28
Specific Heat
0.11 J/(kg K)
  
99+
0.13 J/(kg K)
  
39
Molar Heat Capacity
62.70 J/mol·K
  
1
26.65 J/mol·K
  
26
Thermal Conductivity
10.00 W/m·K
  
99+
35.30 W/m·K
  
38
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
Not Available
  
28.90 µm/(m·K)
  
13
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
179.40 kJ/mol
  
99+
Enthalpy of Fusion
14.39 kJ/mol
  
24
4.77 kJ/mol
  
99+
Enthalpy of Atomization
268.00 kJ/mol
  
40
194.60 kJ/mol
  
99+
Standard Molar Entropy
Not Available
  
64.80 J/mol.K
  
17