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Promethium vs Bohrium

Promethium
Bohrium
Bohrium vs Promethium


Periodic Table
Symbol
Pm  
Bh  
Group Number
3  
15
7  
11
Period Number
6  
7  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440122  
99+
54037148  
12
Space Group Name
-  
-  
Space Group Number
194.00  
7
276.00  
1
Facts
Interesting Facts
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
  • Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
Sources
Found in Minerals, Mining  
Found in Minerals, Mining, Synthetically Produced  
History
  
  
Who Discovered
Chien Shiung Wu, Emilio Segrè, Hans Bethe  
Gesellschaft für Schwerionenforschung  
Discovery
In 1942  
In 1981  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
37
Abundance In Sun
-  
-  
Abundance In Meteorites
-  
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • It is used for research purpose. Very small amount of this metal is used in atomic batteries.
  • Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
  
  • Currently known uses of Bohrium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
-  
Research Purposes  
Biological Properties
  
  
Toxicity
Non Toxic  
-  
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
1,042.00 °C  
99+
-  
Boiling Point
3,000.00 °C  
32
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
-  
Luster
Metallic  
Unknown Luster  
Hardness
  
  
Mohs Hardness
-  
7.00  
3
Brinell Hardness
400.00 MPa  
34
270.00 MPa  
99+
Vickers Hardness
600.00 MPa  
28
2,700.00 MPa  
4
Speed of Sound
2,260.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.70  
27
1.50  
36
Reflectivity
63.00 %  
20
59.00 %  
24
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Pm  
Bh  
Isotopes
  
  
Known Isotopes
27  
12
5  
32
Electronegativity
  
  
Pauling Electronegativity
1.13  
99+
2.00  
8
Sanderson Electronegativity
1.13  
36
1.30  
25
Allred Rochow Electronegativity
1.07  
33
1.30  
25
Mulliken-Jaffe Electronegativity
1.13  
99+
1.30  
33
Allen Electronegativity
1.13  
99+
2.00  
6
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
2.00  
99+
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol  
99+
742.90 kJ/mol  
23
2nd Energy Level
1,050.00 kJ/mol  
99+
1,688.50 kJ/mol  
31
3rd Energy Level
2,150.00 kJ/mol  
99+
2,566.50 kJ/mol  
99+
4th Energy Level
3,970.00 kJ/mol  
99+
3,598.90 kJ/mol  
99+
5th Energy Level
5,400.00 kJ/mol  
99+
4,727.80 kJ/mol  
99+
6th Energy Level
5,400.00 kJ/mol  
99+
5,991.70 kJ/mol  
99+
7th Energy level
5,400.00 kJ/mol  
99+
7,226.80 kJ/mol  
34
8th Energy Level
5,400.00 kJ/mol  
99+
7,100.00 kJ/mol  
33
9th Energy Level
5,400.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
10th Energy Level
5,400.00 kJ/mol  
99+
7,100.00 kJ/mol  
35
11th Energy Level
5,400.00 kJ/mol  
99+
8,200.00 kJ/mol  
25
12th Energy Level
5,400.00 kJ/mol  
99+
82,700.00 kJ/mol  
4
13th Energy Level
5,400.00 kJ/mol  
99+
7,100.00 kJ/mol  
29
14th Energy Level
5,400.00 kJ/mol  
99+
8,200.00 kJ/mol  
17
15th Energy Level
54,000.00 kJ/mol  
99+
82,000.00 kJ/mol  
14
16th Energy Level
54,000.00 kJ/mol  
99+
71,100.00 kJ/mol  
20
17th Energy Level
540.50 kJ/mol  
99+
820.00 kJ/mol  
31
18th Energy Level
5,400.00 kJ/mol  
99+
8,200.00 kJ/mol  
20
19th Energy Level
540.00 kJ/mol  
99+
820.80 kJ/mol  
28
20th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
21
21st Energy Level
540.00 kJ/mol  
99+
8,200.00 kJ/mol  
11
22nd Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
16
23rd Energy Level
540.00 kJ/mol  
99+
8,200.00 kJ/mol  
8
24th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
12
25th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
10
26th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
10
27th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
9
28th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
15
29th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
14
30th Energy Level
540.00 kJ/mol  
99+
820.00 kJ/mol  
10
Electrochemical Equivalent
1.80 g/amp-hr  
40
3.00 g/amp-hr  
21
Electron Work Function
5.30 eV  
5
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
61  
99+
107  
11
Electron Configuration
[Xe] 4f5 6s2  
[Rn] 5f14 6d5 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
61  
99+
107  
11
Number of Neutrons
84  
99+
155  
9
Number of Electrons
61  
99+
107  
11
Radius of an Atom
  
  
Atomic Radius
183.00 pm  
12
128.00 pm  
99+
Covalent Radius
199.00 pm  
12
141.00 pm  
99+
Van der Waals Radius
236.00 pm  
20
0.00 pm  
99+
Atomic Weight
145.00 amu  
99+
270.00 amu  
8
Atomic Volume
22.39 cm3/mol  
21
23.70 cm3/mol  
14
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Seaborgium
  
Next Element
Samarium
  
Hassium
  
Valence Electron Potential
44.10 (-eV)  
40
27.20 (-eV)  
99+
Lattice Constant
-  
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.63  
14
1.57  
99+
Mechanical
Density
  
  
Density At Room Temperature
7.26 g/cm3  
99+
37.10 g/cm3  
3
Density When Liquid (at m.p.)
7.26 g/cm3  
99+
37.10 g/cm3  
3
Tensile Strength
75.00 MPa  
30
152.00 MPa  
24
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
31
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
18.00 GPa  
99+
28.00 GPa  
32
Bulk Modulus
33.00 GPa  
99+
37.00 GPa  
99+
Young's Modulus
46.00 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.28  
17
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.26  
99+
37.00  
5
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
11
0.00 H/m  
11
Susceptibility
0.00  
25
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
0.75 nΩ·m  
99+
6.50 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
-  
Thermal
Specific Heat
0.18 J/(kg K)  
34
0.10 J/(kg K)  
99+
Molar Heat Capacity
27.60 J/mol·K  
20
37.10 J/mol·K  
2
Thermal Conductivity
17.90 W/m·K  
99+
37.00 W/m·K  
36
Critical Temperature
1,315.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
9.00 µm/(m·K)  
99+
14.30 µm/(m·K)  
28
Enthalpy
  
  
Enthalpy of Vaporization
289.00 kJ/mol  
99+
270.50 kJ/mol  
99+
Enthalpy of Fusion
7.50 kJ/mol  
99+
-  
Enthalpy of Atomization
310.00 kJ/mol  
99+
-  
Standard Molar Entropy
57.00 J/mol.K  
30
57.00 J/mol.K  
30
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