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Chromium Uranium Comparison

Chromium
Uranium
Uranium Chromium comparison


Periodic Table
Symbol
Cr  
U  
Group Number
6  
12
0  
18
Period Number
4  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440473  
39
7440611  
28
Space Group Name
Im_ 3m  
Cmcm  
Space Group Number
229.00  
2
63.00  
13
Facts
Interesting Facts
  • 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.
  
  • Major mining countries of Uranium include Russia, Australia, Namibia, Canada and Niger and total 33% Uranium are mine in Kazakhstan.
  
Sources
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
Earth's crust, Mining, Ores of Minerals  
History
  
  
Who Discovered
Louis Nicolas Vauquelin  
-  
Discovery
In Between 1797 - 1798  
In 1789  
Abundance
  
  
Abundance In Universe
0.00 %  
8
0.00 %  
30
Abundance In Sun
0.00 %  
7
0.00 %  
26
Abundance In Meteorites
0.30 %  
7
0.00 %  
99+
Abundance In Earth's Crust
0.01 %  
13
0.00 %  
36
Abundance In Oceans
0.00 %  
16
0.00 %  
11
Abundance In Humans
0.00 %  
19
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • 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.
  
Industrial Uses
Automobile Industry, Chemical Industry  
Ammunition Industry, Chemical Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Jewellery, Nuclear Reactor's Fuel, Sculptures, Statues  
Biological Properties
  
  
Toxicity
Highly Toxic  
Toxic  
Present in Human Body
Yes  
No  
In Blood
0.11 Blood/mg dm-3  
12
0.00 Blood/mg dm-3  
37
In Bone
0.33 p.p.m.  
25
1.20 p.p.m.  
19
Physical
Melting Point
1,857.00 °C  
14
1,132.00 °C  
39
Boiling Point
2,672.00 °C  
99+
3,818.00 °C  
16
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silvery Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
8.50  
1
6.00  
6
Brinell Hardness
687.00 MPa  
18
2,350.00 MPa  
2
Vickers Hardness
1,060.00 MPa  
17
1,960.00 MPa  
6
Speed of Sound
5,940.00 m/s  
8
3,155.00 m/s  
36
Optical Properties
  
  
Refractive Index
2.97  
2
1.38  
40
Reflectivity
70.00 %  
13
80.00 %  
7
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cr  
U  
Isotopes
  
  
Known Isotopes
21  
18
25  
14
Electronegativity
  
  
Pauling Electronegativity
1.66  
19
1.38  
29
Sanderson Electronegativity
1.66  
17
1.38  
22
Allred Rochow Electronegativity
1.56  
11
1.22  
27
Mulliken-Jaffe Electronegativity
1.66  
19
1.38  
29
Allen Electronegativity
1.65  
22
1.38  
36
Electropositivity
  
  
Pauling Electropositivity
2.34  
36
2.62  
26
Ionization Energies
  
  
1st Energy Level
26,130.00 kJ/mol  
1
597.60 kJ/mol  
99+
2nd Energy Level
28,750.00 kJ/mol  
1
1,420.00 kJ/mol  
99+
3rd Energy Level
34,230.00 kJ/mol  
1
1,900.00 kJ/mol  
99+
4th Energy Level
37,066.00 kJ/mol  
1
3,145.00 kJ/mol  
99+
5th Energy Level
97,510.00 kJ/mol  
1
5,976.00 kJ/mol  
99+
6th Energy Level
105,800.00 kJ/mol  
1
5,976.00 kJ/mol  
99+
7th Energy level
114,300.00 kJ/mol  
1
5,970.00 kJ/mol  
99+
8th Energy Level
125,300.00 kJ/mol  
1
5,976.00 kJ/mol  
99+
9th Energy Level
134,700.00 kJ/mol  
1
5,976.00 kJ/mol  
99+
10th Energy Level
144,300.00 kJ/mol  
1
5,976.00 kJ/mol  
99+
11th Energy Level
26,130.00 kJ/mol  
12
5,976.00 kJ/mol  
99+
12th Energy Level
28,750.00 kJ/mol  
36
5,970.00 kJ/mol  
99+
13th Energy Level
34,230.00 kJ/mol  
10
5,970.00 kJ/mol  
99+
14th Energy Level
37,066.00 kJ/mol  
12
5,970.00 kJ/mol  
34
15th Energy Level
97,510.00 kJ/mol  
2
59,700.00 kJ/mol  
99+
16th Energy Level
105,800.00 kJ/mol  
2
59,700.00 kJ/mol  
35
17th Energy Level
114,300.00 kJ/mol  
3
597.60 kJ/mol  
99+
18th Energy Level
125,300.00 kJ/mol  
4
5,976.00 kJ/mol  
99+
19th Energy Level
134,700.00 kJ/mol  
5
597.60 kJ/mol  
99+
20th Energy Level
144,300.00 kJ/mol  
7
597.00 kJ/mol  
99+
21st Energy Level
157,700.00 kJ/mol  
7
597.60 kJ/mol  
99+
22nd Energy Level
166,090.00 kJ/mol  
6
597.00 kJ/mol  
99+
23rd Energy Level
653.80 kJ/mol  
99+
597.60 kJ/mol  
99+
24th Energy Level
653.80 kJ/mol  
32
597.60 kJ/mol  
99+
25th Energy Level
653.80 kJ/mol  
34
597.60 kJ/mol  
99+
26th Energy Level
653.80 kJ/mol  
33
597.60 kJ/mol  
99+
27th Energy Level
652.90 kJ/mol  
34
597.60 kJ/mol  
99+
28th Energy Level
653.80 kJ/mol  
39
597.60 kJ/mol  
99+
29th Energy Level
653.80 kJ/mol  
40
597.60 kJ/mol  
99+
30th Energy Level
653.80 kJ/mol  
36
597.60 kJ/mol  
99+
Electrochemical Equivalent
0.32 g/amp-hr  
99+
1.48 g/amp-hr  
99+
Electron Work Function
4.50 eV  
19
3.63 eV  
99+
Other Chemical Properties
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
24  
99+
92  
26
Electron Configuration
[Ar] 3d5 4s1  
[Rn] 5f3 6d1 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Orthorhombic (ORTH)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
ORTH-Crystal-Structure-of-Uranium.jpg#100  
Atom
  
  
Number of Protons
24  
99+
92  
26
Number of Neutrons
28  
99+
146  
14
Number of Electrons
24  
99+
92  
26
Radius of an Atom
  
  
Atomic Radius
128.00 pm  
99+
156.00 pm  
31
Covalent Radius
139.00 pm  
99+
196.00 pm  
14
Van der Waals Radius
200.00 pm  
35
186.00 pm  
40
Atomic Weight
52.00 amu  
99+
238.03 amu  
21
Atomic Volume
7.23 cm3/mol  
99+
12.59 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Vanadium
  
Protactinium
  
Next Element
Manganese
  
Neptunium
  
Valence Electron Potential
170.00 (-eV)  
4
170.00 (-eV)  
4
Lattice Constant
291.00 pm  
99+
295.08 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.86  
4
1.02  
99+
Mechanical
Density
  
  
Density At Room Temperature
7.19 g/cm3  
99+
19.10 g/cm3  
17
Density When Liquid (at m.p.)
6.30 g/cm3  
99+
17.30 g/cm3  
17
Tensile Strength
689.00 MPa  
7
100.00 MPa  
28
Viscosity
0.00  
23
0.00  
21
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
26
0.00 (Pa)  
37
Vapor Pressure at 2000 K
774.00 (Pa)  
1
0.01 (Pa)  
20
Elasticity properties
  
  
Shear Modulus
115.00 GPa  
9
111.00 GPa  
10
Bulk Modulus
160.00 GPa  
11
100.00 GPa  
16
Young's Modulus
279.00 GPa  
8
208.00 GPa  
11
Poisson Ratio
0.21  
33
0.23  
30
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.19  
99+
18.80  
19
Magnetic Ordering
Antiferromagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
16
Susceptibility
0.00  
10
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Poor Conductor  
Resistivity
125.00 nΩ·m  
27
0.28 nΩ·m  
99+
Electrical Conductivity
0.08 106/cm Ω  
30
0.04 106/cm Ω  
99+
Electron Affinity
64.30 kJ/mol  
17
50.60 kJ/mol  
25
Thermal
Specific Heat
0.45 J/(kg K)  
12
0.12 J/(kg K)  
99+
Molar Heat Capacity
23.35 J/mol·K  
99+
27.67 J/mol·K  
18
Thermal Conductivity
93.90 W/m·K  
17
27.50 W/m·K  
99+
Critical Temperature
1,907.00 K  
24
1,405.00 K  
99+
Thermal Expansion
4.90 µm/(m·K)  
99+
13.90 µm/(m·K)  
30
Enthalpy
  
  
Enthalpy of Vaporization
348.80 kJ/mol  
35
477.00 kJ/mol  
18
Enthalpy of Fusion
15.31 kJ/mol  
20
15.48 kJ/mol  
19
Enthalpy of Atomization
397.50 kJ/mol  
27
489.50 kJ/mol  
18
Standard Molar Entropy
23.80 J/mol.K  
99+
50.20 J/mol.K  
99+
Summary >>
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