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Radium vs Mendelevium

Radium
Mendelevium
Mendelevium vs Radium


Periodic Table
Symbol
Ra   
Md   
Group Number
2   
16
Not Available   
Period Number
7   
7   
Block
s block   
f block   
Element Family
Alkaline Earth   
Actinide   
CAS Number
7440144   
99+
7440111   
99+
Space Group Name
Im_ 3m   
Not Available   
Space Group Number
229.00   
1
Not Available   
Facts
Interesting Facts
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Mining, Ores of metals   
Bombarding Einsteinium with Helium Ions   
History
  
  
Who Discovered
Not Available   
Lawrence Berkeley National Laboratory   
Discovery
In 1898   
In 1955   
Abundance
  
  
Abundance In Earth's Crust
0.00 %   
99+
Not Available   
Abundance In Oceans
0.00 %   
99+
Not Available   
Abundance In Humans
0.00 %   
20
Not Available   
Uses
Uses & Benefits
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
Pharmaceutical Industry   
NA   
Other Uses
NA   
NA   
Biological Properties
  
  
Toxicity
Highly Toxic   
Unknown   
Present in Human Body
No   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
In Bone
Not Available   
0.00 p.p.m.   
36
Physical Properties
Melting Point
700.00 °C   
99+
827.00 °C   
99+
Boiling Point
1,737.00 °C   
99+
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Unknown   
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
Ra   
Md   
Isotopes
  
  
Known Isotopes
33   
6
16   
23
Electronegativity
  
  
Pauling Electronegativity
0.90   
99+
1.30   
32
Allred Rochow Electronegativity
0.97   
38
1.20   
27
Mulliken-Jaffe Electronegativity
0.92   
20
Not Available   
Allen Electronegativity
0.89   
99+
Not Available   
Electropositivity
  
  
Pauling Electropositivity
3.10   
5
2.70   
22
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol   
99+
635.00 kJ/mol   
99+
2nd Energy Level
979.00 kJ/mol   
99+
1,235.00 kJ/mol   
99+
3rd Energy Level
Not Available   
2,470.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,840.00 kJ/mol   
99+
Electrochemical Equivalent
4.22 g/amp-hr   
6
3.21 g/amp-hr   
12
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
88   
30
101   
17
Electron Configuration
[Rn] 7s2   
[Rn] 5f13 7s2   
Crystal Structure
Body Centered Cubic (BCC)   
Not Known   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
Atom
  
  
Number of Protons
88   
30
101   
17
Number of Neutrons
138   
16
157   
7
Number of Electrons
88   
30
101   
17
Radius of an Atom
  
  
Covalent Radius
221.00 pm   
3
Not Available   
Van der Waals Radius
283.00 pm   
4
246.00 pm   
8
Atomic Weight
226.00 amu   
26
258.00 amu   
14
Atomic Volume
45.20 cm3/mol   
4
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Fermium
  
Next Element
Actinium
  
Nobelium
  
Valence Electron Potential
20.10 (-eV)   
99+
Not Available   
Lattice Constant
514.80 pm   
13
Not Available   
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
5.50 g/cm3   
99+
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
NA   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
5.00   
99+
Not Available   
Magnetic Ordering
Nonmagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
NA   
Unknown   
Resistivity
100.00 nΩ·m   
31
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
18.60 W/m·K   
99+
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Atomization
163.00 kJ/mol   
99+
Not Available   
Standard Molar Entropy
71.00 J/mol.K   
14
Not Available   
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