Curium Technetium Comparison
Periodic Table
Symbol
Cm
Tc
Group Number
Not Available
7
11
Period Number
7
5
Block
f block
d block
Element Family
Actinide
Transition Metal
CAS Number
7440519
36
7440268
99+
Space Group Name
Not Available
P63/mmc
Space Group Number
Not Available
194.00
5
Facts
Interesting Facts
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
Sources
Bombarding Plutonium with Helium Ions
Made by Bombarding Molybdenum with Deuterons
History
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Emilio Segrè and Carlo Perriero
Discovery
In 1944
In 1937
Abundance
Uses
Uses & Benefits
- Curium metal is used to provide power to electrical equipment for space missions.
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Research Purposes
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Unknown
Low Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
36
0.00 p.p.m.
36
Physical Properties
Melting Point
1,340.00 °C
34
2,200.00 °C
9
Boiling Point
3,110.00 °C
30
4,877.00 °C
7
Appearance
Physical State
Solid
Solid
Color
Silver
Shiny Gray
Luster
Metallic
NA
Hardness
Speed of Sound
Not Available
16,200.00 m/s
1
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
Cm
Tc
Isotopes
Known Isotopes
15
24
18
21
Electronegativity
Pauling Electronegativity
1.30
32
1.90
11
Allred Rochow Electronegativity
1.20
27
1.36
20
Allen Electronegativity
Not Available
1.51
28
Electropositivity
Pauling Electropositivity
2.70
22
2.10
99+
Ionization Energies
1st Energy Level
581.00 kJ/mol
99+
702.00 kJ/mol
36
2nd Energy Level
1,196.00 kJ/mol
99+
1,470.00 kJ/mol
99+
3rd Energy Level
2,026.00 kJ/mol
99+
2,850.00 kJ/mol
33
4th Energy Level
3,550.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
3.07 g/amp-hr
16
0.52 g/amp-hr
99+
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
96
22
43
99+
Electron Configuration
[Rn] 5f7 6d1 7s2
[Kr] 4d5 5s2
Crystal Structure
Double Hexagonal Close Packed (DHCP)
Hexagonal Close Packed (HCP)
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100
HCP-Crystal-Structure-of-Technetium.jpg#100
Atom
Number of Protons
96
22
43
99+
Number of Neutrons
151
10
55
99+
Number of Electrons
96
22
43
99+
Radius of an Atom
Atomic Radius
174.00 pm
20
136.00 pm
99+
Covalent Radius
169.00 pm
26
147.00 pm
37
Van der Waals Radius
200.00 pm
28
200.00 pm
28
Atomic Weight
247.00 amu
18
98.00 amu
99+
Atomic Volume
18.28 cm3/mol
26
8.50 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
44.50 (-eV)
38
180.00 (-eV)
3
Lattice Constant
Not Available
273.50 pm
99+
Lattice Angles
NA
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
1.60
5
Mechanical Properties
Density
Density At Room Temperature
13.51 g/cm3
25
11.00 g/cm3
34
Density When Liquid (at m.p.)
13.85 g/cm3
10
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
Unknown
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.51
17
11.50
24
Magnetic Ordering
Antiferromagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
1.25 nΩ·m
99+
200.00 nΩ·m
18
Electrical Conductivity
Not Available
0.07 106/cm Ω
30
Electron Affinity
Not Available
53.00 kJ/mol
18
Thermal Properties
Specific Heat
Not Available
0.21 J/(kg K)
29
Molar Heat Capacity
Not Available
24.27 J/mol·K
99+
Thermal Conductivity
Not Available
50.60 W/m·K
30
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
7.10 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
Not Available
660.00 kJ/mol
6
Enthalpy of Fusion
15.00 kJ/mol
21
23.01 kJ/mol
9
Enthalpy of Atomization
Not Available
649.00 kJ/mol
8
Standard Molar Entropy
Not Available
181.10 J/mol.K
2
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