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Protactinium Actinium Comparison

Protactinium
Actinium
Actinium Protactinium comparison


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