Actinium Rhodium Comparison
Periodic Table
Symbol
Ac
Rh
Group Number
Not Available
9
9
Period Number
7
5
Block
f block
d block
Element Family
Actinide
Transition Metal
CAS Number
7440348
99+
7440166
99+
Space Group Name
Fm_ 3m
Fm_ 3m
Space Group Number
225.00
2
225.00
2
Facts
Interesting Facts
Not Available
- 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 Treating Radium with Neutrons, Ores of metals
Earth's crust, Found As a By-product, Found in Minerals, Mining
History
Who Discovered
Friedrich Oskar Giesel
William Hyde Wollaston
Discovery
In 1902
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
- Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
- 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
1,227.00 °C
38
1,966.00 °C
12
Boiling Point
3,200.00 °C
26
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
Ac
Rh
Isotopes
Known Isotopes
29
10
16
23
Electronegativity
Pauling Electronegativity
1.10
99+
2.28
3
Allred Rochow Electronegativity
1.00
36
1.45
16
Allen Electronegativity
Not Available
1.56
24
Electropositivity
Pauling Electropositivity
2.90
10
1.72
99+
Ionization Energies
1st Energy Level
499.00 kJ/mol
99+
719.70 kJ/mol
29
2nd Energy Level
1,170.00 kJ/mol
99+
1,740.00 kJ/mol
26
3rd Energy Level
1,900.00 kJ/mol
99+
2,997.00 kJ/mol
27
4th Energy Level
4,700.00 kJ/mol
23
Not Available
Electrochemical Equivalent
2.82 g/amp-hr
18
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
89
29
45
99+
Electron Configuration
[Rn] 6d1 7s2
[Kr] 4d8 5s1
Crystal Structure
Face Centered Cubic (FCC)
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100
FCC-Crystal-Structure-of-Rhodium.jpg#100
Atom
Number of Protons
89
29
45
99+
Number of Neutrons
138
16
58
99+
Number of Electrons
89
29
45
99+
Radius of an Atom
Atomic Radius
195.00 pm
7
134.00 pm
99+
Covalent Radius
Not Available
142.00 pm
99+
Van der Waals Radius
Not Available
200.00 pm
28
Atomic Weight
227.00 amu
25
102.91 amu
99+
Atomic Volume
22.54 cm3/mol
11
8.30 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
38.60 (-eV)
99+
64.00 (-eV)
22
Lattice Constant
567.00 pm
8
380.34 pm
27
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
10.00 g/cm3
37
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 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
10.07
28
12.41
20
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
Not Available
43.30 nΩ·m
99+
Electrical Conductivity
Not Available
0.21 106/cm Ω
8
Electron Affinity
Not Available
109.70 kJ/mol
7
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
0.24 J/(kg K)
22
Molar Heat Capacity
27.20 J/mol·K
18
24.98 J/mol·K
99+
Thermal Conductivity
12.00 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
Not Available
21.76 kJ/mol
10
Enthalpy of Atomization
301.00 kJ/mol
36
556.50 kJ/mol
12
Standard Molar Entropy
56.50 J/mol.K
25
31.50 J/mol.K
99+
|
||
|
||
|
