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Actinium vs Protactinium

Actinium
Protactinium
Protactinium vs Actinium


Periodic Table
Symbol
Ac   
Pa   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440348   
99+
7440133   
99+
Space Group Name
Fm_ 3m   
I4/mmm   
Space Group Number
225.00   
2
139.00   
8
Facts
Interesting Facts
Not Available   
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
Sources
Obtained by Treating Radium with Neutrons, Ores of metals   
Found in Uranium Ores, Mining, Ores of metals   
History
  
  
Who Discovered
Friedrich Oskar Giesel   
William Crookes   
Discovery
In 1902   
In 1900   
Abundance
  
  
Abundance In Earth's Crust
Not Available   
0.00 %   
99+
Abundance In Oceans
Not Available   
0.00 %   
99+
Uses
Uses & Benefits
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
NA   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
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
1,227.00 °C   
38
1,568.00 °C   
21
Boiling Point
3,200.00 °C   
26
4,027.00 °C   
12
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
NA   
Metallic   
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
Ac   
Pa   
Isotopes
  
  
Known Isotopes
29   
10
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.10   
99+
1.50   
27
Allred Rochow Electronegativity
1.00   
36
1.14   
28
Electropositivity
  
  
Pauling Electropositivity
2.90   
10
2.50   
27
Ionization Energies
  
  
1st Energy Level
499.00 kJ/mol   
99+
568.00 kJ/mol   
99+
2nd Energy Level
1,170.00 kJ/mol   
99+
1,128.00 kJ/mol   
99+
3rd Energy Level
1,900.00 kJ/mol   
99+
1,814.00 kJ/mol   
99+
4th Energy Level
4,700.00 kJ/mol   
23
2,991.00 kJ/mol   
99+
Electrochemical Equivalent
2.82 g/amp-hr   
18
1.72 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
89   
29
91   
27
Electron Configuration
[Rn] 6d1 7s2   
[Rn] 5f2 6d1 7s2   
Crystal Structure
Face Centered Cubic (FCC)   
Tetragonal (TETR)   
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Atom
  
  
Number of Protons
89   
29
91   
27
Number of Neutrons
138   
16
122   
21
Number of Electrons
89   
29
91   
27
Radius of an Atom
  
  
Atomic Radius
195.00 pm   
7
163.00 pm   
25
Covalent Radius
Not Available   
200.00 pm   
11
Van der Waals Radius
Not Available   
243.00 pm   
11
Atomic Weight
227.00 amu   
25
231.04 amu   
24
Atomic Volume
22.54 cm3/mol   
11
15.00 cm3/mol   
34
Adjacent Atomic Numbers
  
  
Previous Element
Radium
  
Thorium
  
Next Element
Thorium
  
Uranium
  
Valence Electron Potential
38.60 (-eV)   
99+
92.00 (-eV)   
11
Lattice Constant
567.00 pm   
8
392.50 pm   
23
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
10.00 g/cm3   
37
15.37 g/cm3   
20
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
NA   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
10.07   
28
15.37   
12
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
177.00 nΩ·m   
21
Electrical Conductivity
Not Available   
0.05 106/cm Ω   
34
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.12 J/(kg K)   
40
Molar Heat Capacity
27.20 J/mol·K   
18
Not Available   
Thermal Conductivity
12.00 W/m·K   
99+
47.00 W/m·K   
32
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
9.90 µm/(m·K)   
40
Enthalpy
  
  
Enthalpy of Fusion
Not Available   
12.34 kJ/mol   
28
Enthalpy of Atomization
301.00 kJ/mol   
36
Not Available   
Standard Molar Entropy
56.50 J/mol.K   
25
198.10 J/mol.K   
1
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