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Promethium vs Radium

Promethium
Radium
Radium vs Promethium


Periodic Table
Symbol
Pm   
Ra   
Group Number
Not Available   
2   
16
Period Number
6   
7   
Block
f block   
s block   
Element Family
Lanthanide   
Alkaline Earth   
CAS Number
7440122   
99+
7440144   
99+
Space Group Name
Not Available   
Im_ 3m   
Space Group Number
Not Available   
229.00   
1
Facts
Interesting Facts
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
  • 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 Minerals, Mining   
Mining, Ores of metals   
History
  
  
Who Discovered
Chien Shiung Wu, Emilio Segrè, Hans Bethe   
Not Available   
Discovery
In 1942   
In 1898   
Abundance
  
  
Abundance In Earth's Crust
Not Available   
0.00 %   
99+
Abundance In Oceans
Not Available   
0.00 %   
99+
Abundance In Humans
Not Available   
0.00 %   
20
Uses
Uses & Benefits
  • It is used for research purpose. Very small amount of this metal is used in atomic batteries.
  • Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
  
  • 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
Non Toxic   
Highly Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
Physical Properties
Melting Point
1,042.00 °C   
99+
700.00 °C   
99+
Boiling Point
3,000.00 °C   
31
1,737.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
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
Pm   
Ra   
Isotopes
  
  
Known Isotopes
27   
12
33   
6
Electronegativity
  
  
Pauling Electronegativity
Not Available   
0.90   
99+
Allred Rochow Electronegativity
1.07   
32
0.97   
38
Mulliken-Jaffe Electronegativity
Not Available   
0.92   
20
Allen Electronegativity
Not Available   
0.89   
99+
Electropositivity
  
  
Pauling Electropositivity
Not Available   
3.10   
5
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol   
99+
509.30 kJ/mol   
99+
2nd Energy Level
1,050.00 kJ/mol   
99+
979.00 kJ/mol   
99+
3rd Energy Level
2,150.00 kJ/mol   
99+
Not Available   
4th Energy Level
3,970.00 kJ/mol   
38
Not Available   
Electrochemical Equivalent
1.80 g/amp-hr   
36
4.22 g/amp-hr   
6
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
61   
99+
88   
30
Electron Configuration
[Xe] 4f5 6s2   
[Rn] 7s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
61   
99+
88   
30
Number of Neutrons
84   
40
138   
16
Number of Electrons
61   
99+
88   
30
Radius of an Atom
  
  
Atomic Radius
183.00 pm   
10
Not Available   
Covalent Radius
199.00 pm   
12
221.00 pm   
3
Van der Waals Radius
236.00 pm   
16
283.00 pm   
4
Atomic Weight
145.00 amu   
99+
226.00 amu   
26
Atomic Volume
22.39 cm3/mol   
12
45.20 cm3/mol   
4
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Francium
  
Next Element
Samarium
  
Actinium
  
Valence Electron Potential
44.10 (-eV)   
39
20.10 (-eV)   
99+
Lattice Constant
Not Available   
514.80 pm   
13
Lattice Angles
Unknown   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
7.26 g/cm3   
99+
5.50 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
18.00 GPa   
36
Not Available   
Bulk Modulus
33.00 GPa   
36
Not Available   
Young's Modulus
46.00 GPa   
38
Not Available   
Poisson Ratio
0.28   
17
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.26   
99+
5.00   
99+
Magnetic Ordering
Paramagnetic   
Nonmagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
0.75 nΩ·m   
99+
100.00 nΩ·m   
31
Electron Affinity
50.00 kJ/mol   
21
Not Available   
Thermal Properties
Specific Heat
0.18 J/(kg K)   
33
0.12 J/(kg K)   
40
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
17.90 W/m·K   
99+
18.60 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.00 µm/(m·K)   
99+
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
7.50 kJ/mol   
99+
Not Available   
Enthalpy of Atomization
310.00 kJ/mol   
34
163.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
71.00 J/mol.K   
14
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