Home
 Compare Metals

Fermium vs Thallium

Fermium
Thallium
Thallium vs Fermium


Periodic Table
Symbol
Fm  
Tl  
Group Number
3  
15
13  
5
Period Number
7  
6  
Block
f block  
p block  
Element Family
Actinide  
Post-​Transition  
CAS Number
7440724  
19
7440280  
99+
Space Group Name
-  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
Sources
Bombarding Pu-239 with Neutrons  
Found As a By-product, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
William Crookes  
Discovery
In 1952  
In 1861  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
33
Abundance In Sun
0.00 %  
30
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
0.00 %  
34
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Fermium metal are limited to research purpose only.
  
  • Thallium is a toxic metal and hence it has limited uses. Thallium metal is mostly used for producing photoelectric cells.
  • In thermometer’s mercury alloy has 8% of thallium, as it has a melting point lower than 20°C.
  
Industrial Uses
-  
Chemical Industry  
Medical Uses
-  
Medical Research  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
-  
Highly Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
38
Physical
Melting Point
1,527.00 °C  
26
303.50 °C  
99+
Boiling Point
0.00 °C  
99+
1,457.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silvery White  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
6.00  
6
1.20  
21
Brinell Hardness
500.00 MPa  
28
26.50 MPa  
99+
Vickers Hardness
600.00 MPa  
28
120.00 MPa  
99+
Speed of Sound
2,500.00 m/s  
99+
818.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.90  
18
Reflectivity
59.00 %  
24
8.00 %  
37
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Fm  
Tl  
Isotopes
  
  
Known Isotopes
18  
21
32  
7
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.62  
22
Sanderson Electronegativity
1.30  
25
2.25  
6
Allred Rochow Electronegativity
1.20  
28
1.44  
18
Mulliken-Jaffe Electronegativity
1.30  
33
1.96  
11
Allen Electronegativity
1.30  
40
1.79  
16
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.38  
33
Ionization Energies
  
  
1st Energy Level
627.00 kJ/mol  
99+
589.40 kJ/mol  
99+
2nd Energy Level
1,225.00 kJ/mol  
99+
1,971.00 kJ/mol  
14
3rd Energy Level
2,363.00 kJ/mol  
99+
2,878.00 kJ/mol  
32
4th Energy Level
3,792.00 kJ/mol  
99+
5,890.00 kJ/mol  
17
5th Energy Level
6,270.00 kJ/mol  
39
5,890.00 kJ/mol  
99+
6th Energy Level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
7th Energy level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
8th Energy Level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
9th Energy Level
7,040.00 kJ/mol  
33
5,890.00 kJ/mol  
99+
10th Energy Level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
11th Energy Level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
12th Energy Level
62,700.00 kJ/mol  
10
5,890.00 kJ/mol  
99+
13th Energy Level
6,270.00 kJ/mol  
38
5,890.00 kJ/mol  
99+
14th Energy Level
6,270.00 kJ/mol  
27
5,890.00 kJ/mol  
37
15th Energy Level
62,700.00 kJ/mol  
38
58,900.00 kJ/mol  
99+
16th Energy Level
62,700.00 kJ/mol  
28
58,900.00 kJ/mol  
38
17th Energy Level
627.00 kJ/mol  
99+
589.40 kJ/mol  
99+
18th Energy Level
6,270.00 kJ/mol  
40
5,890.00 kJ/mol  
99+
19th Energy Level
994.80 kJ/mol  
21
589.40 kJ/mol  
99+
20th Energy Level
627.00 kJ/mol  
99+
589.00 kJ/mol  
99+
21st Energy Level
627.00 kJ/mol  
99+
589.40 kJ/mol  
99+
22nd Energy Level
345.00 kJ/mol  
99+
589.00 kJ/mol  
99+
23rd Energy Level
6,270.00 kJ/mol  
14
589.40 kJ/mol  
99+
24th Energy Level
627.60 kJ/mol  
38
589.40 kJ/mol  
99+
25th Energy Level
627.00 kJ/mol  
40
589.40 kJ/mol  
99+
26th Energy Level
627.60 kJ/mol  
39
589.40 kJ/mol  
99+
27th Energy Level
627.60 kJ/mol  
99+
589.40 kJ/mol  
99+
28th Energy Level
627.60 kJ/mol  
99+
589.40 kJ/mol  
99+
29th Energy Level
627.60 kJ/mol  
99+
589.40 kJ/mol  
99+
30th Energy Level
627.60 kJ/mol  
99+
589.40 kJ/mol  
99+
Electrochemical Equivalent
3.20 g/amp-hr  
15
7.63 g/amp-hr  
2
Electron Work Function
4.47 eV  
21
3.84 eV  
39
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
100  
18
81  
35
Electron Configuration
[Rn] 5f12 7s2  
[Xe] 4f14 5d10 6s2 6p1  
Crystal Structure
Not Known  
Hexagonal Close Packed (HCP)  
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
100  
18
81  
35
Number of Neutrons
157  
8
123  
21
Number of Electrons
100  
18
81  
35
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
170.00 pm  
24
Covalent Radius
180.00 pm  
23
145.00 pm  
99+
Van der Waals Radius
245.00 pm  
13
196.00 pm  
37
Atomic Weight
257.00 amu  
15
204.38 amu  
31
Atomic Volume
18.00 cm3/mol  
99+
17.20 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Einsteinium
  
Mercury
  
Next Element
Mendelevium
  
Lead
  
Valence Electron Potential
0.00 (-eV)  
99+
9.60 (-eV)  
99+
Lattice Constant
350.00 pm  
99+
345.66 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.63  
13
1.60  
23
Mechanical
Density
  
  
Density At Room Temperature
9.70 g/cm3  
99+
11.85 g/cm3  
33
Density When Liquid (at m.p.)
9.70 g/cm3  
99+
11.22 g/cm3  
33
Tensile Strength
0.10 MPa  
99+
47.00 MPa  
39
Viscosity
0.00  
25
0.00  
22
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
16.90 (Pa)  
5
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
2.80 GPa  
99+
Bulk Modulus
50.00 GPa  
24
43.00 GPa  
33
Young's Modulus
0.00 GPa  
99+
8.00 GPa  
99+
Poisson Ratio
0.35  
9
0.45  
2
Other Mechanical Properties
-  
Ductile, Sectile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.70  
99+
11.85  
35
Magnetic Ordering
-  
Diamagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
28
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
7.90 nΩ·m  
99+
0.18 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.06 106/cm Ω  
37
Electron Affinity
0.00 kJ/mol  
99+
19.20 kJ/mol  
38
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
27.00 J/mol·K  
29
26.32 J/mol·K  
37
Thermal Conductivity
0.00 W/m·K  
99+
46.10 W/m·K  
33
Critical Temperature
1,323.00 K  
99+
577.00 K  
99+
Thermal Expansion
11.00 µm/(m·K)  
99+
29.90 µm/(m·K)  
12
Enthalpy
  
  
Enthalpy of Vaporization
319.20 kJ/mol  
99+
162.10 kJ/mol  
99+
Enthalpy of Fusion
13.30 kJ/mol  
30
4.27 kJ/mol  
99+
Enthalpy of Atomization
-  
179.90 kJ/mol  
99+
Standard Molar Entropy
50.00 J/mol.K  
99+
64.20 J/mol.K  
20
Periodic Table >>
<< All

Compare Actinide Series

Actinide Series

Actinide Series

» More Actinide Series

Compare Actinide Series

» More Compare Actinide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!