Home
 Compare Metals

Berkelium vs Promethium

Berkelium
Promethium
Promethium vs Berkelium


Periodic Table
Symbol
Bk  
Pm  
Group Number
14  
4
3  
15
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440406  
99+
7440122  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • X-ray Diffraction- different compounds of Berkelium metals are identified using it.
    Commercial uses of Berkelium metal are not yet discovered.
  
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
Sources
Bombarding Americium with Alpha Particles.  
Found in Minerals, Mining  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Chien Shiung Wu, Emilio Segrè, Hans Bethe  
Discovery
In 1949  
In 1942  
Abundance
  
  
Abundance In Universe
0.00 %  
36
0.00 %  
40
Abundance In Sun
0.00 %  
30
-  
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
0.00 %  
24
Uses
Uses & Benefits
  • This metal is very rare and has no commercial uses.
  
  • 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.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
-  
-  
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
986.00 °C  
99+
1,042.00 °C  
99+
Boiling Point
2,627.00 °C  
99+
3,000.00 °C  
32
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
-  
Brinell Hardness
260.00 MPa  
99+
400.00 MPa  
34
Vickers Hardness
1,070.00 MPa  
16
600.00 MPa  
28
Speed of Sound
2,560.00 m/s  
99+
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.70  
27
Reflectivity
61.00 %  
22
63.00 %  
20
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Bk  
Pm  
Isotopes
  
  
Known Isotopes
14  
25
27  
12
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.13  
99+
Sanderson Electronegativity
1.30  
25
1.13  
36
Allred Rochow Electronegativity
1.20  
28
1.07  
33
Mulliken-Jaffe Electronegativity
1.30  
33
1.13  
99+
Allen Electronegativity
2.70  
1
1.13  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.20  
39
Ionization Energies
  
  
1st Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
2nd Energy Level
1,186.00 kJ/mol  
99+
1,050.00 kJ/mol  
99+
3rd Energy Level
2,152.00 kJ/mol  
99+
2,150.00 kJ/mol  
99+
4th Energy Level
3,434.00 kJ/mol  
99+
3,970.00 kJ/mol  
99+
5th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
6th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
7th Energy level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
8th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
9th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
10th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
11th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
12th Energy Level
60,100.00 kJ/mol  
16
5,400.00 kJ/mol  
99+
13th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
14th Energy Level
6,010.00 kJ/mol  
32
5,400.00 kJ/mol  
99+
15th Energy Level
60,100.00 kJ/mol  
99+
54,000.00 kJ/mol  
99+
16th Energy Level
60,100.00 kJ/mol  
33
54,000.00 kJ/mol  
99+
17th Energy Level
601.00 kJ/mol  
99+
540.50 kJ/mol  
99+
18th Energy Level
6,010.00 kJ/mol  
99+
5,400.00 kJ/mol  
99+
19th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
20th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
21st Energy Level
6,010.00 kJ/mol  
18
540.00 kJ/mol  
99+
22nd Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
23rd Energy Level
6,010.00 kJ/mol  
19
540.00 kJ/mol  
99+
24th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
25th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
26th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
27th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
28th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
29th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
30th Energy Level
601.00 kJ/mol  
99+
540.00 kJ/mol  
99+
Electrochemical Equivalent
3.07 g/amp-hr  
19
1.80 g/amp-hr  
40
Electron Work Function
4.90 eV  
12
5.30 eV  
5
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
97  
21
61  
99+
Electron Configuration
[Rn] 5f9 7s2  
[Xe] 4f5 6s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
DHCP-Crystal-Structure-of-Berkelium.jpg#100  
DHCP-Crystal-Structure-of-Promethium.jpg#100  
Atom
  
  
Number of Protons
97  
21
61  
99+
Number of Neutrons
150  
12
84  
99+
Number of Electrons
97  
21
61  
99+
Radius of an Atom
  
  
Atomic Radius
170.00 pm  
24
183.00 pm  
12
Covalent Radius
170.00 pm  
27
199.00 pm  
12
Van der Waals Radius
244.00 pm  
14
236.00 pm  
20
Atomic Weight
247.00 amu  
18
145.00 amu  
99+
Atomic Volume
13.39 cm3/mol  
99+
22.39 cm3/mol  
21
Adjacent Atomic Numbers
  
  
Previous Element
Curium
  
Neodymium
  
Next Element
Californium
  
Samarium
  
Valence Electron Potential
45.50 (-eV)  
37
44.10 (-eV)  
40
Lattice Constant
341.60 pm  
99+
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.57  
38
1.63  
14
Mechanical
Density
  
  
Density At Room Temperature
14.78 g/cm3  
23
7.26 g/cm3  
99+
Density When Liquid (at m.p.)
13.25 g/cm3  
29
7.26 g/cm3  
99+
Tensile Strength
70.00 MPa  
31
75.00 MPa  
30
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
31
Elasticity properties
  
  
Shear Modulus
27.00 GPa  
34
18.00 GPa  
99+
Bulk Modulus
13.00 GPa  
99+
33.00 GPa  
99+
Young's Modulus
13.00 GPa  
99+
46.00 GPa  
99+
Poisson Ratio
0.35  
9
0.28  
17
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
14.00  
25
7.26  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
13
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
25
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
7.60 nΩ·m  
99+
0.75 nΩ·m  
99+
Electrical Conductivity
0.10 106/cm Ω  
25
0.00 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.18 J/(kg K)  
34
Molar Heat Capacity
27.00 J/mol·K  
29
27.60 J/mol·K  
20
Thermal Conductivity
10.00 W/m·K  
99+
17.90 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,315.00 K  
99+
Thermal Expansion
13.25 µm/(m·K)  
36
9.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
380.00 kJ/mol  
27
289.00 kJ/mol  
99+
Enthalpy of Fusion
13.25 kJ/mol  
31
7.50 kJ/mol  
99+
Enthalpy of Atomization
601.00 kJ/mol  
11
310.00 kJ/mol  
99+
Standard Molar Entropy
52.00 J/mol.K  
37
57.00 J/mol.K  
30
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!