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Americium vs Rhodium

Americium
Rhodium
Rhodium vs Americium


Periodic Table
Symbol
Am   
Rh   
Group Number
Not Available   
9   
9
Period Number
7   
5   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440359   
99+
7440166   
99+
Space Group Name
P63/mmc   
Fm_ 3m   
Space Group Number
194.00   
5
225.00   
2
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).
  
  • Rhodium is the rarest element out of all non-radioactive metals on the earth .
  • Rhodium is one of the most durable and hard metal, which also have high reflectance.
  
Sources
Obtained By Bombarding Plutonium with Neutrons   
Earth's crust, Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso   
William Hyde Wollaston   
Discovery
In 1944   
In 1804   
Abundance
  
  
Abundance In Universe
Not Available   
6 * 10-8 %   
26
Abundance In Sun
~-9999 %   
~0.0000002 %   
25
Abundance In Meteorites
Not Available   
0.00 %   
36
Abundance In Earth's Crust
Not Available   
0.00 %   
99+
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.
  
  • Rhodium metal is mainly used in catalytic converters for cars as it reduces nitrogen oxides in exhaust gases.
  • It is used as an industrial catalyst for nitric acid, acetic acid, hydrogenation reaction, etc.
  
Industrial Uses
NA   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
NA   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
994.00 °C   
99+
1,966.00 °C   
12
Boiling Point
2,607.00 °C   
99+
3,727.00 °C   
17
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
6.00   
6
Brinell Hardness
Not Available   
980.00 MPa   
9
Vickers Hardness
Not Available   
1,100.00 MPa   
9
Speed of Sound
Not Available   
4,700.00 m/s   
15
Optical Properties
  
  
Reflectivity
Not Available   
84.00 %   
4
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   
Rh   
Isotopes
  
  
Known Isotopes
16   
23
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
2.28   
3
Allred Rochow Electronegativity
1.20   
27
1.45   
16
Allen Electronegativity
Not Available   
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
1.72   
99+
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol   
99+
719.70 kJ/mol   
29
2nd Energy Level
1,158.00 kJ/mol   
99+
1,740.00 kJ/mol   
26
3rd Energy Level
2,132.00 kJ/mol   
99+
2,997.00 kJ/mol   
27
4th Energy Level
3,493.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
3.02 g/amp-hr   
17
1.28 g/amp-hr   
99+
Electron Work Function
Not Available   
4.98 eV   
6
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
95   
23
45   
99+
Electron Configuration
[Rn] 5f7 7s2   
[Kr] 4d8 5s1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Face Centered Cubic (FCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Atom
  
  
Number of Protons
95   
23
45   
99+
Number of Neutrons
148   
12
58   
99+
Number of Electrons
95   
23
45   
99+
Radius of an Atom
  
  
Atomic Radius
173.00 pm   
21
134.00 pm   
99+
Covalent Radius
180.00 pm   
21
142.00 pm   
99+
Van der Waals Radius
244.00 pm   
10
200.00 pm   
28
Atomic Weight
243.00 amu   
20
102.91 amu   
99+
Atomic Volume
17.86 cm3/mol   
29
8.30 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Ruthenium
  
Next Element
Curium
  
Palladium
  
Valence Electron Potential
44.00 (-eV)   
40
64.00 (-eV)   
22
Lattice Constant
346.81 pm   
99+
380.34 pm   
27
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
12.00 g/cm3   
30
12.41 g/cm3   
28
Density When Liquid (at m.p.)
Not Available   
10.70 g/cm3   
14
Tensile Strength
Not Available   
951.00 MPa   
5
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
13
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.02 (Pa)   
19
Elasticity properties
  
  
Shear Modulus
Not Available   
150.00 GPa   
6
Bulk Modulus
Not Available   
275.00 GPa   
5
Young's Modulus
Not Available   
380.00 GPa   
5
Poisson Ratio
Not Available   
0.26   
22
Other Mechanical Properties
NA   
Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.67   
15
12.41   
20
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
0.69 nΩ·m   
99+
43.30 nΩ·m   
99+
Electrical Conductivity
0.02 106/cm Ω   
99+
0.21 106/cm Ω   
8
Electron Affinity
Not Available   
109.70 kJ/mol   
7
Thermal Properties
Specific Heat
0.11 J/(kg K)   
99+
0.24 J/(kg K)   
22
Molar Heat Capacity
62.70 J/mol·K   
1
24.98 J/mol·K   
99+
Thermal Conductivity
10.00 W/m·K   
99+
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
8.20 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
495.40 kJ/mol   
12
Enthalpy of Fusion
14.39 kJ/mol   
24
21.76 kJ/mol   
10
Enthalpy of Atomization
268.00 kJ/mol   
40
556.50 kJ/mol   
12
Standard Molar Entropy
Not Available   
31.50 J/mol.K   
99+
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