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Curium vs Protactinium

Curium
Protactinium
Protactinium vs Curium


Periodic Table
Symbol
Cm   
Pa   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440519   
36
7440133   
99+
Space Group Name
Not Available   
I4/mmm   
Space Group Number
Not Available   
139.00   
8
Facts
Interesting Facts
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
Sources
Bombarding Plutonium with Helium Ions   
Found in Uranium Ores, Mining, Ores of metals   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso   
William Crookes   
Discovery
In 1944   
In 1900   
Abundance
  
  
Abundance In Earth's Crust
Not Available   
0.00 %   
99+
Abundance In Oceans
Not Available   
0.00 %   
99+
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
NA   
Biological Properties
  
  
Toxicity
Unknown   
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
1,340.00 °C   
34
1,568.00 °C   
21
Boiling Point
3,110.00 °C   
30
4,027.00 °C   
12
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Metallic   
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
Cm   
Pa   
Isotopes
  
  
Known Isotopes
15   
24
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.50   
27
Allred Rochow Electronegativity
1.20   
27
1.14   
28
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.50   
27
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
568.00 kJ/mol   
99+
2nd Energy Level
1,196.00 kJ/mol   
99+
1,128.00 kJ/mol   
99+
3rd Energy Level
2,026.00 kJ/mol   
99+
1,814.00 kJ/mol   
99+
4th Energy Level
3,550.00 kJ/mol   
99+
2,991.00 kJ/mol   
99+
Electrochemical Equivalent
3.07 g/amp-hr   
16
1.72 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
96   
22
91   
27
Electron Configuration
[Rn] 5f7 6d1 7s2   
[Rn] 5f2 6d1 7s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Tetragonal (TETR)   
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Atom
  
  
Number of Protons
96   
22
91   
27
Number of Neutrons
151   
10
122   
21
Number of Electrons
96   
22
91   
27
Radius of an Atom
  
  
Atomic Radius
174.00 pm   
20
163.00 pm   
25
Covalent Radius
169.00 pm   
26
200.00 pm   
11
Van der Waals Radius
200.00 pm   
28
243.00 pm   
11
Atomic Weight
247.00 amu   
18
231.04 amu   
24
Atomic Volume
18.28 cm3/mol   
26
15.00 cm3/mol   
34
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Thorium
  
Next Element
Berkelium
  
Uranium
  
Valence Electron Potential
44.50 (-eV)   
38
92.00 (-eV)   
11
Lattice Constant
Not Available   
392.50 pm   
23
Lattice Angles
NA   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
13.51 g/cm3   
25
15.37 g/cm3   
20
Density When Liquid (at m.p.)
13.85 g/cm3   
10
Not Available   
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   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.51   
17
15.37   
12
Magnetic Ordering
Antiferromagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
1.25 nΩ·m   
99+
177.00 nΩ·m   
21
Electrical Conductivity
Not Available   
0.05 106/cm Ω   
34
Thermal Properties
Specific Heat
Not Available   
0.12 J/(kg K)   
40
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
Not Available   
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
15.00 kJ/mol   
21
12.34 kJ/mol   
28
Standard Molar Entropy
Not Available   
198.10 J/mol.K   
1
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