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Uranium vs Chromium

Uranium
Chromium
Chromium vs Uranium


Periodic Table
Symbol
U   
Cr   
Group Number
0   
18
6   
12
Period Number
7   
4   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440611   
28
7440473   
39
Space Group Name
Cmcm   
Im_ 3m   
Space Group Number
63.00   
10
229.00   
1
Facts
Interesting Facts
  • Major mining countries of Uranium include Russia, Australia, Namibia, Canada and Niger and total 33% Uranium are mine in Kazakhstan.
  
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
Sources
Earth's crust, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
Not Available   
Louis Nicolas Vauquelin   
Discovery
In 1789   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
2 * 10-8 %   
29
1.5 * 10-3 %   
7
Abundance In Sun
~0.0000001 %   
26
~0.002 %   
7
Abundance In Meteorites
0.00 %   
99+
0.30 %   
7
Abundance In Earth's Crust
0.00 %   
36
0.01 %   
13
Abundance In Oceans
0.00 %   
11
0.00 %   
16
Abundance In Humans
Not Available   
0.00 %   
16
Uses
Uses & Benefits
  • The main use of this metal include nuclear fuel which is used to generate electricity yin nuclear power stations.
  • Synthetic elements like transuranium are made from Uranium metal.
  
  • It is used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
Industrial Uses
Ammunition Industry, Chemical Industry   
Automobile Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Jewellery, Nuclear Reactor's Fuel, Sculptures, Statues   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.11 Blood/mg dm-3   
12
In Bone
Not Available   
0.33 p.p.m.   
21
Physical Properties
Melting Point
1,132.00 °C   
39
1,857.00 °C   
14
Boiling Point
3,818.00 °C   
16
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Gray   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.00   
6
8.50   
1
Brinell Hardness
2,350.00 MPa   
2
687.00 MPa   
16
Vickers Hardness
1,960.00 MPa   
2
1,060.00 MPa   
10
Speed of Sound
3,155.00 m/s   
25
5,940.00 m/s   
5
Optical Properties
  
  
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
U   
Cr   
Isotopes
  
  
Known Isotopes
25   
14
21   
18
Electronegativity
  
  
Pauling Electronegativity
1.38   
28
1.66   
18
Sanderson Electronegativity
Not Available   
1.66   
14
Allred Rochow Electronegativity
1.22   
26
1.56   
10
Allen Electronegativity
Not Available   
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
2.62   
26
2.34   
36
Ionization Energies
  
  
1st Energy Level
597.60 kJ/mol   
99+
26,130.00 kJ/mol   
1
2nd Energy Level
1,420.00 kJ/mol   
99+
28,750.00 kJ/mol   
1
3rd Energy Level
1,900.00 kJ/mol   
99+
34,230.00 kJ/mol   
1
4th Energy Level
3,145.00 kJ/mol   
99+
37,066.00 kJ/mol   
1
5th Energy Level
Not Available   
97,510.00 kJ/mol   
1
6th Energy Level
Not Available   
105,800.00 kJ/mol   
1
7th Energy level
Not Available   
114,300.00 kJ/mol   
1
8th Energy Level
Not Available   
125,300.00 kJ/mol   
1
9th Energy Level
Not Available   
134,700.00 kJ/mol   
1
10th Energy Level
Not Available   
144,300.00 kJ/mol   
1
11th Energy Level
Not Available   
26,130.00 kJ/mol   
12
12th Energy Level
Not Available   
28,750.00 kJ/mol   
13
13th Energy Level
Not Available   
34,230.00 kJ/mol   
10
14th Energy Level
Not Available   
37,066.00 kJ/mol   
12
15th Energy Level
Not Available   
97,510.00 kJ/mol   
1
16th Energy Level
Not Available   
105,800.00 kJ/mol   
2
17th Energy Level
Not Available   
114,300.00 kJ/mol   
3
18th Energy Level
Not Available   
125,300.00 kJ/mol   
4
19th Energy Level
Not Available   
134,700.00 kJ/mol   
5
20th Energy Level
Not Available   
144,300.00 kJ/mol   
7
21st Energy Level
Not Available   
157,700.00 kJ/mol   
7
22nd Energy Level
Not Available   
166,090.00 kJ/mol   
6
Electrochemical Equivalent
1.48 g/amp-hr   
99+
0.32 g/amp-hr   
99+
Electron Work Function
3.63 eV   
30
4.50 eV   
14
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
92   
26
24   
99+
Electron Configuration
[Rn] 5f3 6d1 7s2   
[Ar] 3d5 4s1   
Crystal Structure
Orthorhombic (ORTH)   
Body Centered Cubic (BCC)   
Crystal Lattice
ORTH-Crystal-Structure-of-Uranium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
92   
26
24   
99+
Number of Neutrons
146   
13
28   
99+
Number of Electrons
92   
26
24   
99+
Radius of an Atom
  
  
Atomic Radius
156.00 pm   
29
128.00 pm   
99+
Covalent Radius
196.00 pm   
14
139.00 pm   
99+
Van der Waals Radius
186.00 pm   
33
200.00 pm   
28
Atomic Weight
238.03 amu   
21
52.00 amu   
99+
Atomic Volume
12.59 cm3/mol   
40
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Protactinium
  
Vanadium
  
Next Element
Neptunium
  
Manganese
  
Valence Electron Potential
170.00 (-eV)   
4
170.00 (-eV)   
4
Lattice Constant
295.08 pm   
99+
291.00 pm   
99+
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
19.10 g/cm3   
17
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
17.30 g/cm3   
7
6.30 g/cm3   
40
Tensile Strength
Not Available   
689.00 MPa   
7
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
24
Vapor Pressure at 2000 K
0.01 (Pa)   
20
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
111.00 GPa   
10
115.00 GPa   
9
Bulk Modulus
100.00 GPa   
16
160.00 GPa   
11
Young's Modulus
208.00 GPa   
10
279.00 GPa   
8
Poisson Ratio
0.23   
30
0.21   
32
Other Mechanical Properties
Ductile, Malleable   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
18.80   
10
7.19   
99+
Magnetic Ordering
Paramagnetic   
Antiferromagnetic   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
NA   
Resistivity
0.28 nΩ·m   
99+
125.00 nΩ·m   
27
Electrical Conductivity
0.04 106/cm Ω   
37
0.08 106/cm Ω   
25
Electron Affinity
Not Available   
64.30 kJ/mol   
15
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.45 J/(kg K)   
12
Molar Heat Capacity
27.67 J/mol·K   
15
23.35 J/mol·K   
99+
Thermal Conductivity
27.50 W/m·K   
40
93.90 W/m·K   
17
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
13.90 µm/(m·K)   
27
4.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
477.00 kJ/mol   
13
348.80 kJ/mol   
24
Enthalpy of Fusion
15.48 kJ/mol   
19
15.31 kJ/mol   
20
Enthalpy of Atomization
489.50 kJ/mol   
14
397.50 kJ/mol   
21
Standard Molar Entropy
50.20 J/mol.K   
31
23.80 J/mol.K   
99+
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