Fermium vs Actinium
Periodic Table
Symbol
Fm
Ac
Group Number
Not Available
Not Available
Period Number
7
7
Block
f block
f block
Element Family
Actinide
Actinide
CAS Number
7440724
19
7440348
99+
Space Group Name
Not Available
Fm_ 3m
Space Group Number
Not Available
225.00
2
Facts
Interesting Facts
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
Not Available
Sources
Bombarding Pu-239 with Neutrons
Obtained by Treating Radium with Neutrons, Ores of metals
History
Who Discovered
Lawrence Berkeley National Laboratory
Friedrich Oskar Giesel
Discovery
In 1952
In 1902
Abundance
Uses
Uses & Benefits
- Currently known uses of Fermium metal are limited to research purpose only.
- Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
NA
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Unknown
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
1,527.00 °C
26
1,227.00 °C
38
Boiling Point
Not Available
3,200.00 °C
26
Appearance
Physical State
Solid
Solid
Color
Unknown
Silvery White
Luster
Not Defined
NA
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
Fm
Ac
Isotopes
Known Isotopes
18
21
29
10
Electronegativity
Pauling Electronegativity
1.30
32
1.10
99+
Allred Rochow Electronegativity
1.20
27
1.00
36
Electropositivity
Pauling Electropositivity
2.70
22
2.90
10
Ionization Energies
1st Energy Level
627.00 kJ/mol
99+
499.00 kJ/mol
99+
2nd Energy Level
1,225.00 kJ/mol
99+
1,170.00 kJ/mol
99+
3rd Energy Level
2,363.00 kJ/mol
99+
1,900.00 kJ/mol
99+
4th Energy Level
3,792.00 kJ/mol
99+
4,700.00 kJ/mol
23
Electrochemical Equivalent
3.20 g/amp-hr
13
2.82 g/amp-hr
18
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
100
18
89
29
Electron Configuration
[Rn] 5f12 7s2
[Rn] 6d1 7s2
Crystal Structure
Not Known
Face Centered Cubic (FCC)
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100
FCC-Crystal-Structure-of-Actinium.jpg#100
Atom
Number of Protons
100
18
89
29
Number of Neutrons
157
7
138
16
Number of Electrons
100
18
89
29
Radius of an Atom
Atomic Radius
Not Available
195.00 pm
7
Van der Waals Radius
245.00 pm
9
Not Available
Atomic Weight
257.00 amu
15
227.00 amu
25
Atomic Volume
Not Available
22.54 cm3/mol
11
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
38.60 (-eV)
99+
Lattice Constant
Not Available
567.00 pm
8
Lattice Angles
NA
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
Not Available
10.00 g/cm3
37
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
Not Available
10.07
28
Magnetic Ordering
Unknown
Paramagnetic
Electrical Properties
Thermal Properties
Specific Heat
Not Available
0.12 J/(kg K)
40
Molar Heat Capacity
Not Available
27.20 J/mol·K
18
Thermal Conductivity
Not Available
12.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Atomization
Not Available
301.00 kJ/mol
36
Standard Molar Entropy
Not Available
56.50 J/mol.K
25
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