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Protactinium Chromium Comparison

Protactinium
Chromium
Chromium Protactinium comparison


Periodic Table
Symbol
Pa   
Cr   
Group Number
Not Available   
6   
12
Period Number
7   
4   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440133   
99+
7440473   
39
Space Group Name
I4/mmm   
Im_ 3m   
Space Group Number
139.00   
8
229.00   
1
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • 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
Found in Uranium Ores, Mining, Ores of metals   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
William Crookes   
Louis Nicolas Vauquelin   
Discovery
In 1900   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
Not Available   
1.5 * 10-3 %   
7
Abundance In Sun
~-9999 %   
~0.002 %   
7
Abundance In Meteorites
Not Available   
0.30 %   
7
Abundance In Earth's Crust
0.00 %   
99+
0.01 %   
13
Abundance In Oceans
0.00 %   
99+
0.00 %   
16
Abundance In Humans
Not Available   
0.00 %   
16
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • 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
NA   
Automobile Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Highly Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.11 Blood/mg dm-3   
12
In Bone
0.00 p.p.m.   
36
0.33 p.p.m.   
21
Physical Properties
Melting Point
1,568.00 °C   
21
1,857.00 °C   
14
Boiling Point
4,027.00 °C   
12
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
8.50   
1
Brinell Hardness
Not Available   
687.00 MPa   
16
Vickers Hardness
Not Available   
1,060.00 MPa   
10
Speed of Sound
Not Available   
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
Pa   
Cr   
Isotopes
  
  
Known Isotopes
27   
12
21   
18
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.66   
18
Sanderson Electronegativity
Not Available   
1.66   
14
Allred Rochow Electronegativity
1.14   
28
1.56   
10
Allen Electronegativity
Not Available   
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.34   
36
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
26,130.00 kJ/mol   
1
2nd Energy Level
1,128.00 kJ/mol   
99+
28,750.00 kJ/mol   
1
3rd Energy Level
1,814.00 kJ/mol   
99+
34,230.00 kJ/mol   
1
4th Energy Level
2,991.00 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
1.72 g/amp-hr   
99+
0.32 g/amp-hr   
99+
Electron Work Function
Not Available   
4.50 eV   
14
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
91   
27
24   
99+
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Ar] 3d5 4s1   
Crystal Structure
Tetragonal (TETR)   
Body Centered Cubic (BCC)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
91   
27
24   
99+
Number of Neutrons
122   
21
28   
99+
Number of Electrons
91   
27
24   
99+
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
128.00 pm   
99+
Covalent Radius
200.00 pm   
11
139.00 pm   
99+
Van der Waals Radius
243.00 pm   
11
200.00 pm   
28
Atomic Weight
231.04 amu   
24
52.00 amu   
99+
Atomic Volume
15.00 cm3/mol   
34
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Vanadium
  
Next Element
Uranium
  
Manganese
  
Valence Electron Potential
92.00 (-eV)   
11
170.00 (-eV)   
4
Lattice Constant
392.50 pm   
23
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
15.37 g/cm3   
20
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
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
Not Available   
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
Not Available   
115.00 GPa   
9
Bulk Modulus
Not Available   
160.00 GPa   
11
Young's Modulus
Not Available   
279.00 GPa   
8
Poisson Ratio
Not Available   
0.21   
32
Other Mechanical Properties
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
7.19   
99+
Magnetic Ordering
Paramagnetic   
Antiferromagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
177.00 nΩ·m   
21
125.00 nΩ·m   
27
Electrical Conductivity
0.05 106/cm Ω   
34
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
Not Available   
23.35 J/mol·K   
99+
Thermal Conductivity
47.00 W/m·K   
32
93.90 W/m·K   
17
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
4.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
348.80 kJ/mol   
24
Enthalpy of Fusion
12.34 kJ/mol   
28
15.31 kJ/mol   
20
Enthalpy of Atomization
Not Available   
397.50 kJ/mol   
21
Standard Molar Entropy
198.10 J/mol.K   
1
23.80 J/mol.K   
99+
Summary >>
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