Promethium vs Darmstadtium
Periodic Table
Symbol
Pm
Ds
Group Number
Not Available
10
8
Period Number
6
7
Block
f block
d block
Element Family
Lanthanide
Probably Transition
CAS Number
7440122
99+
54083771
8
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Promethium metal found in Pitchblende.
- Promethium metal is highly radioactive metal.
Not Available
Sources
Found in Minerals, Mining
Synthetically Produced
History
Who Discovered
Chien Shiung Wu, Emilio Segrè, Hans Bethe
Gesellschaft für Schwerionenforschung
Discovery
In 1942
In 1994
Abundance
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 Darmstadtium metal are limited to research purpose only. As only few atoms of this metal are produced.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
NA
Research Purposes
Biological Properties
Toxicity
Non Toxic
Unknown
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
Not Available
0.00 p.p.m.
36
Physical Properties
Melting Point
1,042.00 °C
99+
Not Available
Boiling Point
3,000.00 °C
31
Not Available
Appearance
Physical State
Solid
Solid
Luster
Metallic
Unknown Luster
Hardness
Speed of Sound
Not Available
5,090.00 m/s
9
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
Pm
Ds
Isotopes
Known Isotopes
27
12
9
29
Electronegativity
Allred Rochow Electronegativity
1.07
32
Not Available
Electropositivity
Ionization Energies
1st Energy Level
540.00 kJ/mol
99+
955.20 kJ/mol
5
2nd Energy Level
1,050.00 kJ/mol
99+
1,891.10 kJ/mol
16
3rd Energy Level
2,150.00 kJ/mol
99+
3,029.60 kJ/mol
25
4th Energy Level
3,970.00 kJ/mol
38
3,955.90 kJ/mol
40
5th Energy Level
Not Available
5,113.70 kJ/mol
33
Electrochemical Equivalent
1.80 g/amp-hr
36
Not Available
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
61
99+
110
8
Electron Configuration
[Xe] 4f5 6s2
[Rn] 5f14 6d8 7s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Body Centered Cubic (BCC)
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
61
99+
110
8
Number of Neutrons
84
40
161
3
Number of Electrons
61
99+
110
8
Radius of an Atom
Atomic Radius
183.00 pm
10
132.00 pm
99+
Covalent Radius
199.00 pm
12
128.00 pm
99+
Van der Waals Radius
236.00 pm
16
Not Available
Atomic Weight
145.00 amu
99+
281.00 amu
6
Atomic Volume
22.39 cm3/mol
12
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
44.10 (-eV)
39
Not Available
Lattice Constant
Not Available
Not Available
Lattice Angles
Unknown
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
7.26 g/cm3
99+
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
18.00 GPa
36
Not Available
Bulk Modulus
33.00 GPa
36
Not Available
Young's Modulus
46.00 GPa
38
Not Available
Poisson Ratio
0.28
17
Not Available
Other Mechanical Properties
NA
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
7.26
99+
Not Available
Magnetic Ordering
Paramagnetic
Unknown
Electrical Properties
Electrical Property
Conductor
Unknown
Resistivity
0.75 nΩ·m
99+
Not Available
Electron Affinity
50.00 kJ/mol
21
Not Available
Thermal Properties
Specific Heat
0.18 J/(kg K)
33
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
17.90 W/m·K
99+
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
9.00 µm/(m·K)
99+
Not Available
Enthalpy
Enthalpy of Fusion
7.50 kJ/mol
99+
Not Available
Enthalpy of Atomization
310.00 kJ/mol
34
Not Available
Standard Molar Entropy
Not Available
Not Available
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