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Protactinium vs Radium

Protactinium
Radium
Radium vs Protactinium


Periodic Table
Symbol
Pa   
Ra   
Group Number
Not Available   
2   
16
Period Number
7   
7   
Block
f block   
s block   
Element Family
Actinide   
Alkaline Earth   
CAS Number
7440133   
99+
7440144   
99+
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.
  
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Mining, Ores of metals   
History
  
  
Who Discovered
William Crookes   
Not Available   
Discovery
In 1900   
In 1898   
Abundance
  
  
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
99+
Abundance In Oceans
0.00 %   
99+
0.00 %   
99+
Abundance In Humans
Not Available   
0.00 %   
20
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
Pharmaceutical Industry   
Other Uses
NA   
NA   
Biological Properties
  
  
Toxicity
Highly Toxic   
Highly Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
1,568.00 °C   
21
700.00 °C   
99+
Boiling Point
4,027.00 °C   
12
1,737.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
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
Pa   
Ra   
Isotopes
  
  
Known Isotopes
27   
12
33   
6
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
0.90   
99+
Allred Rochow Electronegativity
1.14   
28
0.97   
38
Mulliken-Jaffe Electronegativity
Not Available   
0.92   
20
Allen Electronegativity
Not Available   
0.89   
99+
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
3.10   
5
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
509.30 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
979.00 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
Not Available   
4th Energy Level
2,991.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.72 g/amp-hr   
99+
4.22 g/amp-hr   
6
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
91   
27
88   
30
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Rn] 7s2   
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
88   
30
Number of Neutrons
122   
21
138   
16
Number of Electrons
91   
27
88   
30
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
Not Available   
Covalent Radius
200.00 pm   
11
221.00 pm   
3
Van der Waals Radius
243.00 pm   
11
283.00 pm   
4
Atomic Weight
231.04 amu   
24
226.00 amu   
26
Atomic Volume
15.00 cm3/mol   
34
45.20 cm3/mol   
4
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Francium
  
Next Element
Uranium
  
Actinium
  
Valence Electron Potential
92.00 (-eV)   
11
20.10 (-eV)   
99+
Lattice Constant
392.50 pm   
23
514.80 pm   
13
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
5.50 g/cm3   
99+
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
5.00   
99+
Magnetic Ordering
Paramagnetic   
Nonmagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
177.00 nΩ·m   
21
100.00 nΩ·m   
31
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   
Not Available   
Thermal Conductivity
47.00 W/m·K   
32
18.60 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   
163.00 kJ/mol   
99+
Standard Molar Entropy
198.10 J/mol.K   
1
71.00 J/mol.K   
14
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