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Curium vs Technetium

Curium
Technetium
Technetium vs Curium


Periodic Table
Symbol
Cm  
Tc  
Group Number
3  
15
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
-  
P63/mmc  
Space Group Number
225.00  
3
194.00  
7
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
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
0.00 %  
30
0.00 %  
18
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
  • 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
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Low 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
1,340.00 °C  
34
2,200.00 °C  
9
Boiling Point
3,110.00 °C  
31
4,877.00 °C  
7
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Shiny Gray  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
2.00  
17
2.25  
16
Brinell Hardness
320.00 MPa  
40
550.00 MPa  
27
Vickers Hardness
461.00 MPa  
37
500.00 MPa  
35
Speed of Sound
2,260.00 m/s  
99+
16,200.00 m/s  
1
Optical Properties
  
  
Refractive Index
1.30  
99+
1.90  
18
Reflectivity
60.00 %  
23
35.00 %  
34
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cm  
Tc  
Isotopes
  
  
Known Isotopes
15  
24
18  
21
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.90  
12
Sanderson Electronegativity
1.30  
25
1.90  
13
Allred Rochow Electronegativity
1.20  
28
1.36  
21
Mulliken-Jaffe Electronegativity
1.30  
33
1.90  
13
Allen Electronegativity
1.30  
40
1.51  
31
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  
34
4th Energy Level
3,550.00 kJ/mol  
99+
7,020.00 kJ/mol  
14
5th Energy Level
5,810.00 kJ/mol  
99+
7,020.00 kJ/mol  
28
6th Energy Level
5,810.00 kJ/mol  
99+
7,020.00 kJ/mol  
99+
7th Energy level
5,810.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
8th Energy Level
5,810.00 kJ/mol  
99+
4,700.00 kJ/mol  
99+
9th Energy Level
6,690.00 kJ/mol  
37
7,020.00 kJ/mol  
35
10th Energy Level
5,810.00 kJ/mol  
99+
7,020.00 kJ/mol  
39
11th Energy Level
5,810.00 kJ/mol  
99+
7,020.00 kJ/mol  
37
12th Energy Level
58,100.00 kJ/mol  
19
7,020.00 kJ/mol  
99+
13th Energy Level
5,810.00 kJ/mol  
99+
7,020.00 kJ/mol  
33
14th Energy Level
5,810.00 kJ/mol  
40
7,020.00 kJ/mol  
23
15th Energy Level
58,100.00 kJ/mol  
99+
70,200.00 kJ/mol  
29
16th Energy Level
58,100.00 kJ/mol  
99+
70,200.00 kJ/mol  
24
17th Energy Level
581.00 kJ/mol  
99+
702.50 kJ/mol  
99+
18th Energy Level
5,810.00 kJ/mol  
99+
7,020.00 kJ/mol  
35
19th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
99+
20th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
35
21st Energy Level
5,810.00 kJ/mol  
20
702.00 kJ/mol  
99+
22nd Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
29
23rd Energy Level
5,810.00 kJ/mol  
20
702.00 kJ/mol  
99+
24th Energy Level
581.00 kJ/mol  
99+
702.50 kJ/mol  
28
25th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
30
26th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
29
27th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
30
28th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
35
29th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
36
30th Energy Level
581.00 kJ/mol  
99+
702.00 kJ/mol  
30
Electrochemical Equivalent
3.07 g/amp-hr  
19
0.52 g/amp-hr  
99+
Electron Work Function
4.50 eV  
19
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes  
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
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  
11
55  
99+
Number of Electrons
96  
22
43  
99+
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
22
136.00 pm  
99+
Covalent Radius
169.00 pm  
28
147.00 pm  
39
Van der Waals Radius
200.00 pm  
35
200.00 pm  
35
Atomic Weight
247.00 amu  
18
98.00 amu  
99+
Atomic Volume
18.28 cm3/mol  
38
8.50 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Molybdenum
  
Next Element
Berkelium
  
Ruthenium
  
Valence Electron Potential
44.50 (-eV)  
39
180.00 (-eV)  
3
Lattice Constant
336.25 pm  
99+
273.50 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.67  
11
1.60  
21
Mechanical
Density
  
  
Density At Room Temperature
13.51 g/cm3  
26
11.00 g/cm3  
36
Density When Liquid (at m.p.)
13.85 g/cm3  
25
11.00 g/cm3  
34
Tensile Strength
350.00 MPa  
12
50.00 MPa  
38
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)  
24
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
27.00 GPa  
34
Bulk Modulus
40.00 GPa  
38
100.00 GPa  
16
Young's Modulus
0.00 GPa  
99+
50.00 GPa  
39
Poisson Ratio
0.35  
9
0.38  
6
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.51  
28
11.50  
37
Magnetic Ordering
Antiferromagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
1.25 nΩ·m  
99+
200.00 nΩ·m  
18
Electrical Conductivity
0.13 106/cm Ω  
19
0.07 106/cm Ω  
35
Electron Affinity
0.00 kJ/mol  
99+
53.00 kJ/mol  
23
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.21 J/(kg K)  
30
Molar Heat Capacity
27.50 J/mol·K  
21
24.27 J/mol·K  
99+
Thermal Conductivity
11.00 W/m·K  
99+
50.60 W/m·K  
30
Critical Temperature
1,340.00 K  
99+
2,150.00 K  
16
Thermal Expansion
11.60 µm/(m·K)  
99+
7.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
331.60 kJ/mol  
40
660.00 kJ/mol  
7
Enthalpy of Fusion
15.00 kJ/mol  
22
23.01 kJ/mol  
9
Enthalpy of Atomization
-  
649.00 kJ/mol  
9
Standard Molar Entropy
52.50 J/mol.K  
36
181.10 J/mol.K  
2
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