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Barium vs Rhodium

Barium
Rhodium
Rhodium vs Barium


Periodic Table
Symbol
Ba   
Rh   
Group Number
2   
16
9   
9
Period Number
6   
5   
Block
s block   
d block   
Element Family
Alkaline Earth   
Transition Metal   
CAS Number
7440393   
99+
7440166   
99+
Space Group Name
Im_ 3m   
Fm_ 3m   
Space Group Number
229.00   
1
225.00   
2
Facts
Interesting Facts
  • Barium oxidizes very easily in the air.
  • All toxic compounds of Barium can easily dissolve in water.
  • Barium carbonate is used to produce a Rat poison and its other compound Barium nitrate is used in fireworks to produce green color.
  
  • 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
Carl Wilhelm Scheele   
William Hyde Wollaston   
Discovery
In 1772   
In 1804   
Abundance
  
  
Abundance In Universe
1 * 10-6 %   
16
6 * 10-8 %   
26
Abundance In Sun
~0.000001 %   
18
~0.0000002 %   
25
Abundance In Meteorites
0.00 %   
20
0.00 %   
36
Abundance In Earth's Crust
0.03 %   
11
0.00 %   
99+
Abundance In Oceans
0.00 %   
8
Not Available   
Abundance In Humans
0.00 %   
12
Not Available   
Uses
Uses & Benefits
  • It is sued in chemical paint manufacturing and glass manufacturing.
  • Compounds of this metal are toxic; but still the barium sulfate is insoluble and given to patients suffering from digestive disorder.
  
  • 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
Ammunition Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
NA   
Present in Human Body
Yes   
No   
In Blood
0.07 Blood/mg dm-3   
15
Not Available   
In Bone
70.00 p.p.m.   
9
Not Available   
Physical Properties
Melting Point
725.00 °C   
99+
1,966.00 °C   
12
Boiling Point
1,140.00 °C   
99+
3,727.00 °C   
17
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Gray   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
1.25   
19
6.00   
6
Brinell Hardness
Not Available   
980.00 MPa   
9
Vickers Hardness
Not Available   
1,100.00 MPa   
9
Speed of Sound
1,620.00 m/s   
99+
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
Ba   
Rh   
Isotopes
  
  
Known Isotopes
37   
2
16   
23
Electronegativity
  
  
Pauling Electronegativity
0.89   
99+
2.28   
3
Sanderson Electronegativity
0.68   
28
Not Available   
Allred Rochow Electronegativity
0.97   
38
1.45   
16
Mulliken-Jaffe Electronegativity
0.88   
22
Not Available   
Allen Electronegativity
0.88   
99+
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
3.11   
4
1.72   
99+
Ionization Energies
  
  
1st Energy Level
502.90 kJ/mol   
99+
719.70 kJ/mol   
29
2nd Energy Level
965.20 kJ/mol   
99+
1,740.00 kJ/mol   
26
3rd Energy Level
3,600.00 kJ/mol   
14
2,997.00 kJ/mol   
27
Electrochemical Equivalent
2.56 g/amp-hr   
20
1.28 g/amp-hr   
99+
Electron Work Function
2.70 eV   
99+
4.98 eV   
6
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
56   
99+
45   
99+
Electron Configuration
[Xe] 6s2   
[Kr] 4d8 5s1   
Crystal Structure
Body Centered Cubic (BCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Atom
  
  
Number of Protons
56   
99+
45   
99+
Number of Neutrons
81   
99+
58   
99+
Number of Electrons
56   
99+
45   
99+
Radius of an Atom
  
  
Atomic Radius
222.00 pm   
4
134.00 pm   
99+
Covalent Radius
215.00 pm   
5
142.00 pm   
99+
Van der Waals Radius
268.00 pm   
6
200.00 pm   
28
Atomic Weight
137.33 amu   
99+
102.91 amu   
99+
Atomic Volume
39.24 cm3/mol   
5
8.30 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Cesium
  
Ruthenium
  
Next Element
Lanthanum
  
Palladium
  
Valence Electron Potential
21.30 (-eV)   
99+
64.00 (-eV)   
22
Lattice Constant
502.80 pm   
15
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
3.51 g/cm3   
99+
12.41 g/cm3   
28
Density When Liquid (at m.p.)
3.34 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
7.11 (Pa)   
6
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.02 (Pa)   
19
Elasticity properties
  
  
Shear Modulus
4.90 GPa   
99+
150.00 GPa   
6
Bulk Modulus
9.60 GPa   
99+
275.00 GPa   
5
Young's Modulus
13.00 GPa   
99+
380.00 GPa   
5
Poisson Ratio
Not Available   
0.26   
22
Other Mechanical Properties
NA   
Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
3.62   
99+
12.41   
20
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Superconductor   
Conductor   
Resistivity
332.00 nΩ·m   
13
43.30 nΩ·m   
99+
Electrical Conductivity
0.03 106/cm Ω   
40
0.21 106/cm Ω   
8
Electron Affinity
13.95 kJ/mol   
36
109.70 kJ/mol   
7
Thermal Properties
Specific Heat
0.20 J/(kg K)   
30
0.24 J/(kg K)   
22
Molar Heat Capacity
28.07 J/mol·K   
12
24.98 J/mol·K   
99+
Thermal Conductivity
18.40 W/m·K   
99+
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
20.60 µm/(m·K)   
22
8.20 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
140.00 kJ/mol   
99+
495.40 kJ/mol   
12
Enthalpy of Fusion
7.66 kJ/mol   
99+
21.76 kJ/mol   
10
Enthalpy of Atomization
175.70 kJ/mol   
99+
556.50 kJ/mol   
12
Standard Molar Entropy
62.50 J/mol.K   
20
31.50 J/mol.K   
99+
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