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Neptunium vs Rhodium

Neptunium
Rhodium
Rhodium vs Neptunium


Periodic Table
Symbol
Np  
Rh  
Group Number
3  
15
9  
9
Period Number
7  
5  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7439998  
99+
7440166  
99+
Space Group Name
Pnma  
Fm_ 3m  
Space Group Number
62.00  
14
225.00  
3
Facts
Interesting Facts
Neptunium was the first transuranium element to be discovered.  
  • 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
Made by Bombarding Uranium with Neutrons, Ores of metals  
Earth's crust, Found As a By-product, Found in Minerals, Mining  
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson  
William Hyde Wollaston  
Discovery
In 1940  
In 1804  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
27
Abundance In Sun
0.00 %  
26
0.00 %  
25
Abundance In Meteorites
0.00 %  
99+
0.00 %  
36
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
  • 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
-  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
640.00 °C  
99+
1,966.00 °C  
12
Boiling Point
3,902.00 °C  
13
3,727.00 °C  
17
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
6.00  
6
Brinell Hardness
622.00 MPa  
23
980.00 MPa  
10
Vickers Hardness
640.00 MPa  
23
1,100.00 MPa  
15
Speed of Sound
2,260.00 m/s  
99+
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
1.30  
99+
2.40  
7
Reflectivity
64.00 %  
19
84.00 %  
5
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Np  
Rh  
Isotopes
  
  
Known Isotopes
20  
19
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.36  
30
2.28  
4
Sanderson Electronegativity
1.36  
23
2.28  
5
Allred Rochow Electronegativity
1.22  
27
1.45  
17
Mulliken-Jaffe Electronegativity
1.36  
31
2.28  
4
Allen Electronegativity
1.36  
37
1.56  
27
Electropositivity
  
  
Pauling Electropositivity
2.64  
25
1.72  
99+
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol  
99+
719.70 kJ/mol  
29
2nd Energy Level
1,128.00 kJ/mol  
99+
1,740.00 kJ/mol  
27
3rd Energy Level
1,997.00 kJ/mol  
99+
2,997.00 kJ/mol  
27
4th Energy Level
3,242.00 kJ/mol  
99+
7,197.00 kJ/mol  
11
5th Energy Level
6,180.00 kJ/mol  
99+
7,197.00 kJ/mol  
26
6th Energy Level
5,785.00 kJ/mol  
99+
7,197.00 kJ/mol  
40
7th Energy level
6,040.00 kJ/mol  
99+
7,197.00 kJ/mol  
35
8th Energy Level
6,040.00 kJ/mol  
99+
3,480.00 kJ/mol  
99+
9th Energy Level
6,180.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
10th Energy Level
6,180.00 kJ/mol  
99+
7,197.00 kJ/mol  
33
11th Energy Level
6,180.00 kJ/mol  
99+
7,197.00 kJ/mol  
32
12th Energy Level
61,800.00 kJ/mol  
13
7,190.00 kJ/mol  
99+
13th Energy Level
6,180.00 kJ/mol  
40
7,190.00 kJ/mol  
27
14th Energy Level
6,180.00 kJ/mol  
29
7,197.00 kJ/mol  
21
15th Energy Level
60,600.00 kJ/mol  
99+
71,900.00 kJ/mol  
23
16th Energy Level
60,420.00 kJ/mol  
31
71,900.00 kJ/mol  
18
17th Energy Level
604.00 kJ/mol  
99+
719.70 kJ/mol  
39
18th Energy Level
6,040.00 kJ/mol  
99+
7,197.00 kJ/mol  
29
19th Energy Level
604.50 kJ/mol  
99+
719.70 kJ/mol  
36
20th Energy Level
604.00 kJ/mol  
99+
719.00 kJ/mol  
30
21st Energy Level
6,040.00 kJ/mol  
17
719.70 kJ/mol  
99+
22nd Energy Level
604.00 kJ/mol  
40
719.00 kJ/mol  
24
23rd Energy Level
6,040.00 kJ/mol  
18
719.70 kJ/mol  
99+
24th Energy Level
604.50 kJ/mol  
99+
719.70 kJ/mol  
23
25th Energy Level
604.00 kJ/mol  
99+
719.00 kJ/mol  
23
26th Energy Level
604.00 kJ/mol  
99+
719.70 kJ/mol  
23
27th Energy Level
604.00 kJ/mol  
99+
719.70 kJ/mol  
22
28th Energy Level
604.00 kJ/mol  
99+
719.70 kJ/mol  
28
29th Energy Level
604.00 kJ/mol  
99+
719.70 kJ/mol  
29
30th Energy Level
604.00 kJ/mol  
99+
719.00 kJ/mol  
23
Electrochemical Equivalent
1.77 g/amp-hr  
99+
1.28 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
4.98 eV  
10
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes  
Atomic
Atomic Number
93  
25
45  
99+
Electron Configuration
[Rn] 5f4 6d1 7s2  
[Kr] 4d8 5s1  
Crystal Structure
Orthorhombic (ORTH)  
Face Centered Cubic (FCC)  
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
FCC-Crystal-Structure-of-Rhodium.jpg#100  
Atom
  
  
Number of Protons
93  
25
45  
99+
Number of Neutrons
144  
15
58  
99+
Number of Electrons
93  
25
45  
99+
Radius of an Atom
  
  
Atomic Radius
155.00 pm  
32
134.00 pm  
99+
Covalent Radius
190.00 pm  
18
142.00 pm  
99+
Van der Waals Radius
221.00 pm  
27
200.00 pm  
35
Atomic Weight
237.00 amu  
22
102.91 amu  
99+
Atomic Volume
11.62 cm3/mol  
99+
8.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Ruthenium
  
Next Element
Plutonium
  
Palladium
  
Valence Electron Potential
96.00 (-eV)  
9
64.00 (-eV)  
22
Lattice Constant
666.30 pm  
3
380.34 pm  
30
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.43  
99+
1.73  
7
Mechanical
Density
  
  
Density At Room Temperature
19.38 g/cm3  
14
12.41 g/cm3  
30
Density When Liquid (at m.p.)
20.25 g/cm3  
10
10.70 g/cm3  
35
Tensile Strength
125.00 MPa  
26
951.00 MPa  
5
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.11 (Pa)  
17
0.02 (Pa)  
19
Elasticity properties
  
  
Shear Modulus
5.60 GPa  
99+
150.00 GPa  
6
Bulk Modulus
180.00 GPa  
9
275.00 GPa  
5
Young's Modulus
46.00 GPa  
99+
380.00 GPa  
5
Poisson Ratio
0.26  
22
0.26  
22
Other Mechanical Properties
Ductile  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
20.25  
15
12.41  
32
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
6
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
1.22 nΩ·m  
99+
43.30 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.21 106/cm Ω  
8
Electron Affinity
118.60 kJ/mol  
6
109.70 kJ/mol  
8
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.24 J/(kg K)  
22
Molar Heat Capacity
29.46 J/mol·K  
10
24.98 J/mol·K  
99+
Thermal Conductivity
6.30 W/m·K  
99+
150.00 W/m·K  
9
Critical Temperature
913.00 K  
99+
2,237.00 K  
13
Thermal Expansion
13.30 µm/(m·K)  
35
8.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
336.00 kJ/mol  
39
495.40 kJ/mol  
16
Enthalpy of Fusion
3.20 kJ/mol  
99+
21.76 kJ/mol  
10
Enthalpy of Atomization
275.30 kJ/mol  
99+
556.50 kJ/mol  
16
Standard Molar Entropy
64.00 J/mol.K  
21
31.50 J/mol.K  
99+
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