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Americium vs Thallium

Americium
Thallium
Thallium vs Americium


Periodic Table
Symbol
Am   
Tl   
Group Number
Not Available   
13   
5
Period Number
7   
6   
Block
f block   
p block   
Element Family
Actinide   
Post-​Transition   
CAS Number
7440359   
99+
7440280   
99+
Space Group Name
P63/mmc   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
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).
  
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
Sources
Obtained By Bombarding Plutonium with Neutrons   
Found As a By-product, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso   
William Crookes   
Discovery
In 1944   
In 1861   
Abundance
  
  
Abundance In Universe
Not Available   
5 * 10-9 %   
32
Abundance In Sun
~-9999 %   
~0.0000001 %   
26
Abundance In Meteorites
Not Available   
0.00 %   
99+
Abundance In Earth's Crust
Not Available   
0.00 %   
99+
Abundance In Oceans
Not Available   
0.00 %   
34
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.
  
  • Thallium is a toxic metal and hence it has limited uses. Thallium metal is mostly used for producing photoelectric cells.
  • In thermometer’s mercury alloy has 8% of thallium, as it has a melting point lower than 20°C.
  
Industrial Uses
NA   
Chemical Industry   
Medical Uses
NA   
Medical Research   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
34
In Bone
0.00 p.p.m.   
36
0.00 p.p.m.   
33
Physical Properties
Melting Point
994.00 °C   
99+
303.50 °C   
99+
Boiling Point
2,607.00 °C   
99+
1,457.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
1.20   
20
Brinell Hardness
Not Available   
26.50 MPa   
99+
Speed of Sound
Not Available   
818.00 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 Properties
Chemical Formula
Am   
Tl   
Isotopes
  
  
Known Isotopes
16   
23
32   
7
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.62   
21
Sanderson Electronegativity
Not Available   
2.25   
5
Allred Rochow Electronegativity
1.20   
27
1.44   
17
Mulliken-Jaffe Electronegativity
Not Available   
1.96   
6
Allen Electronegativity
Not Available   
1.79   
13
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.38   
33
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol   
99+
589.40 kJ/mol   
99+
2nd Energy Level
1,158.00 kJ/mol   
99+
1,971.00 kJ/mol   
14
3rd Energy Level
2,132.00 kJ/mol   
99+
2,878.00 kJ/mol   
32
4th Energy Level
3,493.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
3.02 g/amp-hr   
17
7.63 g/amp-hr   
2
Electron Work Function
Not Available   
3.84 eV   
28
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
95   
23
81   
35
Electron Configuration
[Rn] 5f7 7s2   
[Xe] 4f14 5d10 6s2 6p1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
95   
23
81   
35
Number of Neutrons
148   
12
123   
20
Number of Electrons
95   
23
81   
35
Radius of an Atom
  
  
Atomic Radius
173.00 pm   
21
170.00 pm   
22
Covalent Radius
180.00 pm   
21
145.00 pm   
39
Van der Waals Radius
244.00 pm   
10
196.00 pm   
30
Atomic Weight
243.00 amu   
20
204.38 amu   
31
Atomic Volume
17.86 cm3/mol   
29
17.20 cm3/mol   
31
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Mercury
  
Next Element
Curium
  
Lead
  
Valence Electron Potential
44.00 (-eV)   
40
9.60 (-eV)   
99+
Lattice Constant
346.81 pm   
99+
345.66 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
6
Mechanical Properties
Density
  
  
Density At Room Temperature
12.00 g/cm3   
30
11.85 g/cm3   
31
Density When Liquid (at m.p.)
Not Available   
11.22 g/cm3   
13
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
13
16.90 (Pa)   
5
Elasticity properties
  
  
Shear Modulus
Not Available   
2.80 GPa   
99+
Bulk Modulus
Not Available   
43.00 GPa   
28
Young's Modulus
Not Available   
8.00 GPa   
99+
Poisson Ratio
Not Available   
0.45   
2
Other Mechanical Properties
NA   
Ductile, Sectile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.67   
15
11.85   
22
Magnetic Ordering
Paramagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
0.69 nΩ·m   
99+
0.18 nΩ·m   
99+
Electrical Conductivity
0.02 106/cm Ω   
99+
0.06 106/cm Ω   
32
Electron Affinity
Not Available   
19.20 kJ/mol   
32
Thermal Properties
Specific Heat
0.11 J/(kg K)   
99+
0.13 J/(kg K)   
39
Molar Heat Capacity
62.70 J/mol·K   
1
26.32 J/mol·K   
29
Thermal Conductivity
10.00 W/m·K   
99+
46.10 W/m·K   
33
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
29.90 µm/(m·K)   
12
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
162.10 kJ/mol   
99+
Enthalpy of Fusion
14.39 kJ/mol   
24
4.27 kJ/mol   
99+
Enthalpy of Atomization
268.00 kJ/mol   
40
179.90 kJ/mol   
99+
Standard Molar Entropy
Not Available   
64.20 J/mol.K   
19
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