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Rhodium vs Scandium

Rhodium
Scandium
Scandium vs Rhodium


Periodic Table
Symbol
Rh   
Sc   
Group Number
9   
9
3   
15
Period Number
5   
4   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440166   
99+
7440202   
99+
Space Group Name
Fm_ 3m   
P63/mmc   
Space Group Number
225.00   
2
194.00   
5
Facts
Interesting Facts
  • 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.
  
  • Scandium is known as one of the rare earth elements.
  • Scandium metal found in rare minerals called Wolframite .
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
William Hyde Wollaston   
Lars Fredrik Nilson   
Discovery
In 1804   
In 1879   
Abundance
  
  
Abundance In Universe
6 * 10-8 %   
26
3 * 10-6 %   
15
Abundance In Sun
~0.0000002 %   
25
~0.000004 %   
16
Abundance In Meteorites
0.00 %   
36
0.00 %   
18
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
23
Abundance In Oceans
Not Available   
0.00 %   
32
Uses
Uses & Benefits
  • 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.
  
  • Uses of Scandium are limited to research purpose only. However, it has very low density and higher melting point.
  • Its compounds like scandium iodide is used in mercury vapor lamps to produce very bright white light.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
NA   
Non Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.01 Blood/mg dm-3   
22
In Bone
Not Available   
0.00 p.p.m.   
34
Physical Properties
Melting Point
1,966.00 °C   
12
1,539.00 °C   
24
Boiling Point
3,727.00 °C   
17
2,832.00 °C   
35
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
Metallic   
Lustrous   
Hardness
  
  
Mohs Hardness
6.00   
6
Not Available   
Brinell Hardness
980.00 MPa   
9
750.00 MPa   
12
Vickers Hardness
1,100.00 MPa   
9
Not Available   
Speed of Sound
4,700.00 m/s   
15
Not Available   
Optical Properties
  
  
Reflectivity
84.00 %   
4
Not Available   
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
Rh   
Sc   
Isotopes
  
  
Known Isotopes
16   
23
13   
26
Electronegativity
  
  
Pauling Electronegativity
2.28   
3
1.36   
29
Sanderson Electronegativity
Not Available   
1.02   
21
Allred Rochow Electronegativity
1.45   
16
1.20   
27
Allen Electronegativity
1.56   
24
1.19   
36
Electropositivity
  
  
Pauling Electropositivity
1.72   
99+
2.64   
25
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol   
29
633.10 kJ/mol   
99+
2nd Energy Level
1,740.00 kJ/mol   
26
1,235.00 kJ/mol   
99+
3rd Energy Level
2,997.00 kJ/mol   
27
2,388.60 kJ/mol   
99+
4th Energy Level
Not Available   
7,090.60 kJ/mol   
6
5th Energy Level
Not Available   
8,843.00 kJ/mol   
6
6th Energy Level
Not Available   
10,679.00 kJ/mol   
7
7th Energy level
Not Available   
13,310.00 kJ/mol   
8
8th Energy Level
Not Available   
15,250.00 kJ/mol   
11
9th Energy Level
Not Available   
17,370.00 kJ/mol   
14
10th Energy Level
Not Available   
21,726.00 kJ/mol   
13
11th Energy Level
Not Available   
24,102.00 kJ/mol   
16
12th Energy Level
Not Available   
66,320.00 kJ/mol   
2
13th Energy Level
Not Available   
73,010.00 kJ/mol   
2
14th Energy Level
Not Available   
80,160.00 kJ/mol   
3
15th Energy Level
Not Available   
89,490.00 kJ/mol   
4
16th Energy Level
Not Available   
97,400.00 kJ/mol   
5
17th Energy Level
Not Available   
105,600.00 kJ/mol   
6
18th Energy Level
Not Available   
117,000.00 kJ/mol   
7
19th Energy Level
Not Available   
124,270.00 kJ/mol   
8
Electrochemical Equivalent
1.28 g/amp-hr   
99+
0.56 g/amp-hr   
99+
Electron Work Function
4.98 eV   
6
3.50 eV   
31
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes   
Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
45   
99+
21   
99+
Electron Configuration
[Kr] 4d8 5s1   
[Ar] 3d1 4s2   
Crystal Structure
Face Centered Cubic (FCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100   
HCP-Crystal-Structure-of-Scandium.jpg#100   
Atom
  
  
Number of Protons
45   
99+
21   
99+
Number of Neutrons
58   
99+
24   
99+
Number of Electrons
45   
99+
21   
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm   
99+
162.00 pm   
26
Covalent Radius
142.00 pm   
99+
170.00 pm   
25
Van der Waals Radius
200.00 pm   
28
211.00 pm   
25
Atomic Weight
102.91 amu   
99+
44.96 amu   
99+
Atomic Volume
8.30 cm3/mol   
99+
15.00 cm3/mol   
34
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Calcium
  
Next Element
Palladium
  
Titanium
  
Valence Electron Potential
64.00 (-eV)   
22
58.00 (-eV)   
24
Lattice Constant
380.34 pm   
27
330.90 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.59   
7
Mechanical Properties
Density
  
  
Density At Room Temperature
12.41 g/cm3   
28
2.99 g/cm3   
99+
Density When Liquid (at m.p.)
10.70 g/cm3   
14
2.80 g/cm3   
99+
Tensile Strength
951.00 MPa   
5
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
22
Vapor Pressure at 2000 K
0.02 (Pa)   
19
91.30 (Pa)   
3
Elasticity properties
  
  
Shear Modulus
150.00 GPa   
6
29.10 GPa   
24
Bulk Modulus
275.00 GPa   
5
56.60 GPa   
21
Young's Modulus
380.00 GPa   
5
74.40 GPa   
26
Poisson Ratio
0.26   
22
0.28   
18
Other Mechanical Properties
Malleable   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
12.41   
20
2.99   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
43.30 nΩ·m   
99+
562.00 nΩ·m   
10
Electrical Conductivity
0.21 106/cm Ω   
8
0.02 106/cm Ω   
99+
Electron Affinity
109.70 kJ/mol   
7
18.10 kJ/mol   
33
Thermal Properties
Specific Heat
0.24 J/(kg K)   
22
0.60 J/(kg K)   
8
Molar Heat Capacity
24.98 J/mol·K   
99+
25.52 J/mol·K   
37
Thermal Conductivity
150.00 W/m·K   
9
15.80 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
8.20 µm/(m·K)   
99+
10.20 µm/(m·K)   
39
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol   
12
314.20 kJ/mol   
28
Enthalpy of Fusion
21.76 kJ/mol   
10
14.10 kJ/mol   
25
Enthalpy of Atomization
556.50 kJ/mol   
12
343.00 kJ/mol   
28
Standard Molar Entropy
31.50 J/mol.K   
99+
34.60 J/mol.K   
99+
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