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Gallium vs Rhodium

Gallium
Rhodium
Rhodium vs Gallium


Periodic Table
Symbol
Ga   
Rh   
Group Number
13   
5
9   
9
Period Number
4   
5   
Block
p block   
d block   
Element Family
Post-​Transition   
Transition Metal   
CAS Number
7440553   
32
7440166   
99+
Space Group Name
Cmca   
Fm_ 3m   
Space Group Number
64.00   
9
225.00   
2
Facts
Interesting Facts
  • A gram of Gallium metal can be bought for only three dollars.
  • Gallium metal found in ores of following things Coal, Bauxite, Diaspore, Sphalerite, Germanite and Zinc.
  
  • 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
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
Earth's crust, Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
Lecoq de Boisbaudran   
William Hyde Wollaston   
Discovery
In 1875   
In 1804   
Abundance
  
  
Abundance In Universe
1 * 10-6 %   
16
6 * 10-8 %   
26
Abundance In Sun
~0.000004 %   
16
~0.0000002 %   
25
Abundance In Meteorites
0.00 %   
16
0.00 %   
36
Abundance In Earth's Crust
0.00 %   
24
0.00 %   
99+
Abundance In Oceans
0.00 %   
22
Not Available   
Uses
Uses & Benefits
  • Gallium arsenide is a very important component of many semiconductors and led manufacturing.
  • Gallium nitride is also know as a semiconductor and it is used in Blu-ray technology, mobile smartphones and LED.
  
  • 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
Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
Surgical Instruments Manufacturing   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Non Toxic   
NA   
Present in Human Body
Yes   
No   
In Blood
0.08 Blood/mg dm-3   
13
Not Available   
Physical Properties
Melting Point
29.78 °C   
99+
1,966.00 °C   
12
Boiling Point
2,403.00 °C   
99+
3,727.00 °C   
17
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
1.50   
18
6.00   
6
Brinell Hardness
56.80 MPa   
99+
980.00 MPa   
9
Vickers Hardness
Not Available   
1,100.00 MPa   
9
Speed of Sound
2,740.00 m/s   
31
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
Ga   
Rh   
Isotopes
  
  
Known Isotopes
24   
15
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.81   
15
2.28   
3
Sanderson Electronegativity
2.42   
2
Not Available   
Allred Rochow Electronegativity
1.82   
1
1.45   
16
Mulliken-Jaffe Electronegativity
2.01   
5
Not Available   
Allen Electronegativity
1.76   
14
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
2.19   
39
1.72   
99+
Ionization Energies
  
  
1st Energy Level
578.80 kJ/mol   
99+
719.70 kJ/mol   
29
2nd Energy Level
1,979.30 kJ/mol   
13
1,740.00 kJ/mol   
26
3rd Energy Level
2,963.00 kJ/mol   
28
2,997.00 kJ/mol   
27
4th Energy Level
6,180.00 kJ/mol   
8
Not Available   
Electrochemical Equivalent
0.87 g/amp-hr   
99+
1.28 g/amp-hr   
99+
Electron Work Function
4.20 eV   
23
4.98 eV   
6
Other Chemical Properties
Ionization, Radioactive Isotopes   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
31   
99+
45   
99+
Electron Configuration
[Ar] 3d10 4s2 4p1   
[Kr] 4d8 5s1   
Crystal Structure
Orthorhombic (ORTH)   
Face Centered Cubic (FCC)   
Crystal Lattice
ORTH-Crystal-Structure-of-Gallium.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Atom
  
  
Number of Protons
31   
99+
45   
99+
Number of Neutrons
39   
99+
58   
99+
Number of Electrons
31   
99+
45   
99+
Radius of an Atom
  
  
Atomic Radius
135.00 pm   
99+
134.00 pm   
99+
Covalent Radius
122.00 pm   
99+
142.00 pm   
99+
Van der Waals Radius
187.00 pm   
32
200.00 pm   
28
Atomic Weight
69.72 amu   
99+
102.91 amu   
99+
Atomic Volume
11.80 cm3/mol   
99+
8.30 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Zinc
  
Ruthenium
  
Next Element
Rubidium
  
Palladium
  
Valence Electron Potential
69.70 (-eV)   
19
64.00 (-eV)   
22
Lattice Constant
451.97 pm   
18
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
5.91 g/cm3   
99+
12.41 g/cm3   
28
Density When Liquid (at m.p.)
6.10 g/cm3   
99+
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)   
15
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
9.80 GPa   
99+
380.00 GPa   
5
Poisson Ratio
0.47   
1
0.26   
22
Other Mechanical Properties
NA   
Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
5.91   
99+
12.41   
20
Magnetic Ordering
Diamagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Semiconductor   
Conductor   
Resistivity
270.00 nΩ·m   
15
43.30 nΩ·m   
99+
Electrical Conductivity
0.07 106/cm Ω   
29
0.21 106/cm Ω   
8
Electron Affinity
28.90 kJ/mol   
31
109.70 kJ/mol   
7
Thermal Properties
Specific Heat
0.37 J/(kg K)   
16
0.24 J/(kg K)   
22
Molar Heat Capacity
25.86 J/mol·K   
35
24.98 J/mol·K   
99+
Thermal Conductivity
40.60 W/m·K   
34
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
18.00 µm/(m·K)   
24
8.20 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
256.10 kJ/mol   
36
495.40 kJ/mol   
12
Enthalpy of Fusion
5.59 kJ/mol   
99+
21.76 kJ/mol   
10
Enthalpy of Atomization
276.10 kJ/mol   
39
556.50 kJ/mol   
12
Standard Molar Entropy
40.80 J/mol.K   
38
31.50 J/mol.K   
99+
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