Radium vs Fermium
Periodic Table
Symbol
Ra
Fm
Group Number
2
16
Not Available
Period Number
7
7
Block
s block
f block
Element Family
Alkaline Earth
Actinide
CAS Number
7440144
99+
7440724
19
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.
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
Sources
Mining, Ores of metals
Bombarding Pu-239 with Neutrons
History
Who Discovered
Not Available
Lawrence Berkeley National Laboratory
Discovery
In 1898
In 1952
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 Fermium 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+
1,527.00 °C
26
Boiling Point
1,737.00 °C
99+
Not Available
Appearance
Physical State
Solid
Solid
Color
Silvery White
Unknown
Luster
Metallic
Not Defined
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
Fm
Isotopes
Known Isotopes
33
6
18
21
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+
627.00 kJ/mol
99+
2nd Energy Level
979.00 kJ/mol
99+
1,225.00 kJ/mol
99+
3rd Energy Level
Not Available
2,363.00 kJ/mol
99+
4th Energy Level
Not Available
3,792.00 kJ/mol
99+
Electrochemical Equivalent
4.22 g/amp-hr
6
3.20 g/amp-hr
13
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
88
30
100
18
Electron Configuration
[Rn] 7s2
[Rn] 5f12 7s2
Crystal Structure
Body Centered Cubic (BCC)
Not Known
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
Unknown-Crystal-Structure-of-Fermium.jpg#100
Atom
Number of Protons
88
30
100
18
Number of Neutrons
138
16
157
7
Number of Electrons
88
30
100
18
Radius of an Atom
Covalent Radius
221.00 pm
3
Not Available
Van der Waals Radius
283.00 pm
4
245.00 pm
9
Atomic Weight
226.00 amu
26
257.00 amu
15
Atomic Volume
45.20 cm3/mol
4
Not Available
Adjacent Atomic Numbers
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
NA
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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