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Roentgenium vs Fermium

Roentgenium
Fermium
Fermium vs Roentgenium


Periodic Table
Symbol
Rg  
Fm  
Group Number
11  
7
3  
15
Period Number
7  
7  
Block
d block  
f block  
Element Family
-  
Actinide  
CAS Number
54386242  
1
7440724  
19
Space Group Name
-  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
Roentgenium is a highly unstable synthetic element.  
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
Sources
Synthetically Produced  
Bombarding Pu-239 with Neutrons  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
Lawrence Berkeley National Laboratory  
Discovery
In 1994  
In 1952  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
35
Abundance In Sun
-  
0.00 %  
30
Abundance In Meteorites
-  
0.00 %  
99+
Abundance In Earth's Crust
-  
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
-  
-  
Uses
Uses & Benefits
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
  • Currently known uses of Fermium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
-  
Biological Properties
  
  
Toxicity
-  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
-  
1,527.00 °C  
26
Boiling Point
2,800.00 °C  
38
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
-  
Luster
Unknown Luster  
-  
Hardness
  
  
Mohs Hardness
-  
6.00  
6
Brinell Hardness
700.00 MPa  
17
500.00 MPa  
28
Vickers Hardness
450.00 MPa  
38
600.00 MPa  
28
Speed of Sound
3,430.00 m/s  
32
2,500.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
64.00 %  
19
59.00 %  
24
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rg  
Fm  
Isotopes
  
  
Known Isotopes
1  
34
18  
21
Electronegativity
  
  
Pauling Electronegativity
0.00  
99+
1.30  
33
Sanderson Electronegativity
1.90  
13
1.30  
25
Allred Rochow Electronegativity
1.30  
25
1.20  
28
Mulliken-Jaffe Electronegativity
0.90  
99+
1.30  
33
Allen Electronegativity
0.80  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
2.70  
22
Ionization Energies
  
  
1st Energy Level
1,022.70 kJ/mol  
3
627.00 kJ/mol  
99+
2nd Energy Level
2,074.40 kJ/mol  
10
1,225.00 kJ/mol  
99+
3rd Energy Level
3,077.90 kJ/mol  
24
2,363.00 kJ/mol  
99+
4th Energy Level
4,052.40 kJ/mol  
99+
3,792.00 kJ/mol  
99+
5th Energy Level
5,306.70 kJ/mol  
99+
6,270.00 kJ/mol  
39
6th Energy Level
11,100.00 kJ/mol  
10
6,270.00 kJ/mol  
99+
7th Energy level
5,800.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
8th Energy Level
5,800.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
9th Energy Level
5,650.00 kJ/mol  
99+
7,040.00 kJ/mol  
33
10th Energy Level
5,800.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
11th Energy Level
8,300.00 kJ/mol  
24
6,270.00 kJ/mol  
99+
12th Energy Level
8,300.00 kJ/mol  
99+
62,700.00 kJ/mol  
10
13th Energy Level
8,700.00 kJ/mol  
16
6,270.00 kJ/mol  
38
14th Energy Level
8,300.00 kJ/mol  
16
6,270.00 kJ/mol  
27
15th Energy Level
87,000.00 kJ/mol  
9
62,700.00 kJ/mol  
38
16th Energy Level
83,000.00 kJ/mol  
11
62,700.00 kJ/mol  
28
17th Energy Level
830.80 kJ/mol  
30
627.00 kJ/mol  
99+
18th Energy Level
8,300.00 kJ/mol  
19
6,270.00 kJ/mol  
40
19th Energy Level
580.00 kJ/mol  
99+
994.80 kJ/mol  
21
20th Energy Level
580.00 kJ/mol  
99+
627.00 kJ/mol  
99+
21st Energy Level
5,800.00 kJ/mol  
21
627.00 kJ/mol  
99+
22nd Energy Level
580.00 kJ/mol  
99+
345.00 kJ/mol  
99+
23rd Energy Level
5,800.00 kJ/mol  
21
6,270.00 kJ/mol  
14
24th Energy Level
538.70 kJ/mol  
99+
627.60 kJ/mol  
38
25th Energy Level
0.00 kJ/mol  
99+
627.00 kJ/mol  
40
26th Energy Level
580.00 kJ/mol  
99+
627.60 kJ/mol  
39
27th Energy Level
580.00 kJ/mol  
99+
627.60 kJ/mol  
99+
28th Energy Level
880.00 kJ/mol  
8
627.60 kJ/mol  
99+
29th Energy Level
580.00 kJ/mol  
99+
627.60 kJ/mol  
99+
30th Energy Level
0.00 kJ/mol  
99+
627.60 kJ/mol  
99+
Electrochemical Equivalent
3.10 g/amp-hr  
18
3.20 g/amp-hr  
15
Electron Work Function
4.90 eV  
12
4.47 eV  
21
Other Chemical Properties
-  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
111  
7
100  
18
Electron Configuration
[Rn] 5f14 6d9 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
111  
7
100  
18
Number of Neutrons
161  
4
157  
8
Number of Electrons
111  
7
100  
18
Radius of an Atom
  
  
Atomic Radius
200.00 pm  
7
180.00 pm  
16
Covalent Radius
126.00 pm  
99+
180.00 pm  
23
Van der Waals Radius
280.00 pm  
6
245.00 pm  
13
Atomic Weight
281.00 amu  
6
257.00 amu  
15
Atomic Volume
28.70 cm3/mol  
12
18.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Darmstadtium
  
Einsteinium
  
Next Element
Copernicium
  
Mendelevium
  
Valence Electron Potential
11.90 (-eV)  
99+
0.00 (-eV)  
99+
Lattice Constant
0.00 pm  
99+
350.00 pm  
99+
Lattice Angles
-  
-  
Lattice C/A Ratio
1.90  
1
1.63  
13
Mechanical
Density
  
  
Density At Room Temperature
28.70 g/cm3  
6
9.70 g/cm3  
99+
Density When Liquid (at m.p.)
28.70 g/cm3  
7
9.70 g/cm3  
99+
Tensile Strength
65.00 MPa  
33
0.10 MPa  
99+
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
99+
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
26.00 GPa  
36
30.00 GPa  
27
Bulk Modulus
0.00 GPa  
99+
50.00 GPa  
24
Young's Modulus
12.70 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.30  
14
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
28.70  
8
9.70  
99+
Magnetic Ordering
-  
-  
Permeability
0.00 H/m  
12
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.20 nΩ·m  
99+
7.90 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.10 J/(kg K)  
99+
Molar Heat Capacity
23.70 J/mol·K  
99+
27.00 J/mol·K  
29
Thermal Conductivity
0.10 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,100.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
12.60 µm/(m·K)  
40
11.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
580.00 kJ/mol  
12
319.20 kJ/mol  
99+
Enthalpy of Fusion
-  
13.30 kJ/mol  
30
Enthalpy of Atomization
580.00 kJ/mol  
14
-  
Standard Molar Entropy
57.00 J/mol.K  
30
50.00 J/mol.K  
99+
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