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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  
2
225.00  
3
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
0.00 %  
17
0.00 %  
27
Abundance In Sun
0.00 %  
18
0.00 %  
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
-  
Abundance In Humans
0.00 %  
13
0.00 %  
24
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
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.07 Blood/mg dm-3  
15
0.00 Blood/mg dm-3  
37
In Bone
70.00 p.p.m.  
9
0.00 p.p.m.  
99+
Physical
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
-  
Metallic  
Hardness
  
  
Mohs Hardness
1.25  
20
6.00  
6
Brinell Hardness
130.00 MPa  
99+
980.00 MPa  
10
Vickers Hardness
210.00 MPa  
99+
1,100.00 MPa  
15
Speed of Sound
1,620.00 m/s  
99+
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
1.47  
38
2.40  
7
Reflectivity
65.00 %  
18
84.00 %  
5
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ba  
Rh  
Isotopes
  
  
Known Isotopes
37  
2
16  
23
Electronegativity
  
  
Pauling Electronegativity
0.89  
99+
2.28  
4
Sanderson Electronegativity
0.68  
99+
2.28  
5
Allred Rochow Electronegativity
0.97  
39
1.45  
17
Mulliken-Jaffe Electronegativity
0.88  
99+
2.28  
4
Allen Electronegativity
0.88  
99+
1.56  
27
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  
27
3rd Energy Level
3,600.00 kJ/mol  
14
2,997.00 kJ/mol  
27
4th Energy Level
502.90 kJ/mol  
99+
7,197.00 kJ/mol  
11
5th Energy Level
5,020.00 kJ/mol  
99+
7,197.00 kJ/mol  
26
6th Energy Level
5,020.00 kJ/mol  
99+
7,197.00 kJ/mol  
40
7th Energy level
5,020.00 kJ/mol  
99+
7,197.00 kJ/mol  
35
8th Energy Level
5,020.00 kJ/mol  
99+
3,480.00 kJ/mol  
99+
9th Energy Level
5,020.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
10th Energy Level
5,020.00 kJ/mol  
99+
7,197.00 kJ/mol  
33
11th Energy Level
5,020.00 kJ/mol  
99+
7,197.00 kJ/mol  
32
12th Energy Level
5,020.00 kJ/mol  
99+
7,190.00 kJ/mol  
99+
13th Energy Level
5,020.00 kJ/mol  
99+
7,190.00 kJ/mol  
27
14th Energy Level
5,020.00 kJ/mol  
99+
7,197.00 kJ/mol  
21
15th Energy Level
50,200.00 kJ/mol  
99+
71,900.00 kJ/mol  
23
16th Energy Level
50,270.00 kJ/mol  
99+
71,900.00 kJ/mol  
18
17th Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
39
18th Energy Level
5,020.00 kJ/mol  
99+
7,197.00 kJ/mol  
29
19th Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
36
20th Energy Level
502.00 kJ/mol  
99+
719.00 kJ/mol  
30
21st Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
99+
22nd Energy Level
502.00 kJ/mol  
99+
719.00 kJ/mol  
24
23rd Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
99+
24th Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
23
25th Energy Level
503.00 kJ/mol  
99+
719.00 kJ/mol  
23
26th Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
23
27th Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
22
28th Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
28
29th Energy Level
502.90 kJ/mol  
99+
719.70 kJ/mol  
29
30th Energy Level
503.00 kJ/mol  
99+
719.00 kJ/mol  
23
Electrochemical Equivalent
2.56 g/amp-hr  
24
1.28 g/amp-hr  
99+
Electron Work Function
2.70 eV  
99+
4.98 eV  
10
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes  
Atomic
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  
5
134.00 pm  
99+
Covalent Radius
215.00 pm  
5
142.00 pm  
99+
Van der Waals Radius
268.00 pm  
8
200.00 pm  
35
Atomic Weight
137.33 amu  
99+
102.91 amu  
99+
Atomic Volume
39.24 cm3/mol  
6
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  
17
380.34 pm  
30
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
99+
1.73  
7
Mechanical
Density
  
  
Density At Room Temperature
3.51 g/cm3  
99+
12.41 g/cm3  
30
Density When Liquid (at m.p.)
3.34 g/cm3  
99+
10.70 g/cm3  
35
Tensile Strength
55.00 MPa  
37
951.00 MPa  
5
Viscosity
0.00  
2
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
7.11 (Pa)  
6
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
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
0.22  
31
0.26  
22
Other Mechanical Properties
-  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
3.62  
99+
12.41  
32
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
15
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Superconductor  
Conductor  
Resistivity
332.00 nΩ·m  
13
43.30 nΩ·m  
99+
Electrical Conductivity
0.03 106/cm Ω  
99+
0.21 106/cm Ω  
8
Electron Affinity
13.95 kJ/mol  
99+
109.70 kJ/mol  
8
Thermal
Specific Heat
0.20 J/(kg K)  
31
0.24 J/(kg K)  
22
Molar Heat Capacity
28.07 J/mol·K  
15
24.98 J/mol·K  
99+
Thermal Conductivity
18.40 W/m·K  
99+
150.00 W/m·K  
9
Critical Temperature
1,000.00 K  
99+
2,237.00 K  
13
Thermal Expansion
20.60 µm/(m·K)  
24
8.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
140.00 kJ/mol  
99+
495.40 kJ/mol  
16
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  
16
Standard Molar Entropy
62.50 J/mol.K  
25
31.50 J/mol.K  
99+
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