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Protactinium vs Lawrencium

Protactinium
Lawrencium
Lawrencium vs Protactinium


Periodic Table
Symbol
Pa   
Lr   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
d block   
Element Family
Actinide   
Actinide   
CAS Number
7440133   
99+
22537195   
15
Space Group Name
I4/mmm   
Not Available   
Space Group Number
139.00   
8
Not Available   
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • It is synthetically produced metal.
  • Radiation hazard can be produce by it.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Bombarding Californium-252 with Boron Nuclei, Found in Minerals, Mining   
History
  
  
Who Discovered
William Crookes   
Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research   
Discovery
In 1900   
In 1961–1971   
Abundance
  
  
Abundance In Earth's Crust
0.00 %   
99+
Not Available   
Abundance In Oceans
0.00 %   
99+
Not Available   
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Currently known uses of Lawrencium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
NA   
Biological Properties
  
  
Toxicity
Highly Toxic   
Unknown   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
37
In Bone
0.00 p.p.m.   
36
0.00 p.p.m.   
36
Physical Properties
Melting Point
1,568.00 °C   
21
1,627.00 °C   
20
Boiling Point
4,027.00 °C   
12
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Metallic   
Unknown Luster   
Hardness
  
  
Speed of Sound
Not Available   
Not Available   
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   
Lr   
Isotopes
  
  
Known Isotopes
27   
12
10   
28
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
Not Available   
Allred Rochow Electronegativity
1.14   
28
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
Not Available   
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
470.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,428.00 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
2,228.00 kJ/mol   
99+
4th Energy Level
2,991.00 kJ/mol   
99+
4,910.00 kJ/mol   
21
Electrochemical Equivalent
1.72 g/amp-hr   
99+
3.23 g/amp-hr   
11
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
91   
27
103   
15
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Rn] 5f14 7s2 7p1   
Crystal Structure
Tetragonal (TETR)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
91   
27
103   
15
Number of Neutrons
122   
21
157   
7
Number of Electrons
91   
27
103   
15
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
Not Available   
Covalent Radius
200.00 pm   
11
Not Available   
Van der Waals Radius
243.00 pm   
11
246.00 pm   
8
Atomic Weight
231.04 amu   
24
266.00 amu   
12
Atomic Volume
15.00 cm3/mol   
34
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Nobelium
  
Next Element
Uranium
  
Rutherfordium
  
Valence Electron Potential
92.00 (-eV)   
11
Not Available   
Lattice Constant
392.50 pm   
23
Not Available   
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3   
20
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
0.32   
12
Other Mechanical Properties
Unknown   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
Not Available   
Magnetic Ordering
Paramagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
177.00 nΩ·m   
21
Not Available   
Electrical Conductivity
0.05 106/cm Ω   
34
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
47.00 W/m·K   
32
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
12.34 kJ/mol   
28
Not Available   
Standard Molar Entropy
198.10 J/mol.K   
1
Not Available   
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