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Technetium vs Curium

Technetium
Curium
Curium vs Technetium


Periodic Table
Symbol
Tc  
Cm  
Group Number
7  
11
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440268  
99+
7440519  
36
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Sources
Made by Bombarding Molybdenum with Deuterons  
Bombarding Plutonium with Helium Ions  
History
  
  
Who Discovered
Emilio Segrè and Carlo Perriero  
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Discovery
In 1937  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
35
Abundance In Sun
0.00 %  
18
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
Uses
Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • Curium metal is used to provide power to electrical equipment for space missions.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
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
2,200.00 °C  
9
1,340.00 °C  
34
Boiling Point
4,877.00 °C  
7
3,110.00 °C  
31
Appearance
  
  
Physical State
Solid  
Solid  
Color
Shiny Gray  
Silver  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
2.25  
16
2.00  
17
Brinell Hardness
550.00 MPa  
27
320.00 MPa  
40
Vickers Hardness
500.00 MPa  
35
461.00 MPa  
37
Speed of Sound
16,200.00 m/s  
1
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.90  
18
1.30  
99+
Reflectivity
35.00 %  
34
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Tc  
Cm  
Isotopes
  
  
Known Isotopes
18  
21
15  
24
Electronegativity
  
  
Pauling Electronegativity
1.90  
12
1.30  
33
Sanderson Electronegativity
1.90  
13
1.30  
25
Allred Rochow Electronegativity
1.36  
21
1.20  
28
Mulliken-Jaffe Electronegativity
1.90  
13
1.30  
33
Allen Electronegativity
1.51  
31
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol  
36
581.00 kJ/mol  
99+
2nd Energy Level
1,470.00 kJ/mol  
99+
1,196.00 kJ/mol  
99+
3rd Energy Level
2,850.00 kJ/mol  
34
2,026.00 kJ/mol  
99+
4th Energy Level
7,020.00 kJ/mol  
14
3,550.00 kJ/mol  
99+
5th Energy Level
7,020.00 kJ/mol  
28
5,810.00 kJ/mol  
99+
6th Energy Level
7,020.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
7th Energy level
4,700.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
8th Energy Level
4,700.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
7,020.00 kJ/mol  
35
6,690.00 kJ/mol  
37
10th Energy Level
7,020.00 kJ/mol  
39
5,810.00 kJ/mol  
99+
11th Energy Level
7,020.00 kJ/mol  
37
5,810.00 kJ/mol  
99+
12th Energy Level
7,020.00 kJ/mol  
99+
58,100.00 kJ/mol  
19
13th Energy Level
7,020.00 kJ/mol  
33
5,810.00 kJ/mol  
99+
14th Energy Level
7,020.00 kJ/mol  
23
5,810.00 kJ/mol  
40
15th Energy Level
70,200.00 kJ/mol  
29
58,100.00 kJ/mol  
99+
16th Energy Level
70,200.00 kJ/mol  
24
58,100.00 kJ/mol  
99+
17th Energy Level
702.50 kJ/mol  
99+
581.00 kJ/mol  
99+
18th Energy Level
7,020.00 kJ/mol  
35
5,810.00 kJ/mol  
99+
19th Energy Level
702.00 kJ/mol  
99+
581.00 kJ/mol  
99+
20th Energy Level
702.00 kJ/mol  
35
581.00 kJ/mol  
99+
21st Energy Level
702.00 kJ/mol  
99+
5,810.00 kJ/mol  
20
22nd Energy Level
702.00 kJ/mol  
29
581.00 kJ/mol  
99+
23rd Energy Level
702.00 kJ/mol  
99+
5,810.00 kJ/mol  
20
24th Energy Level
702.50 kJ/mol  
28
581.00 kJ/mol  
99+
25th Energy Level
702.00 kJ/mol  
30
581.00 kJ/mol  
99+
26th Energy Level
702.00 kJ/mol  
29
581.00 kJ/mol  
99+
27th Energy Level
702.00 kJ/mol  
30
581.00 kJ/mol  
99+
28th Energy Level
702.00 kJ/mol  
35
581.00 kJ/mol  
99+
29th Energy Level
702.00 kJ/mol  
36
581.00 kJ/mol  
99+
30th Energy Level
702.00 kJ/mol  
30
581.00 kJ/mol  
99+
Electrochemical Equivalent
0.52 g/amp-hr  
99+
3.07 g/amp-hr  
19
Electron Work Function
4.90 eV  
12
4.50 eV  
19
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
43  
99+
96  
22
Electron Configuration
[Kr] 4d5 5s2  
[Rn] 5f7 6d1 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100  
DHCP-Crystal-Structure-of-Curium.jpg#100  
Atom
  
  
Number of Protons
43  
99+
96  
22
Number of Neutrons
55  
99+
151  
11
Number of Electrons
43  
99+
96  
22
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
174.00 pm  
22
Covalent Radius
147.00 pm  
39
169.00 pm  
28
Van der Waals Radius
200.00 pm  
35
200.00 pm  
35
Atomic Weight
98.00 amu  
99+
247.00 amu  
18
Atomic Volume
8.50 cm3/mol  
99+
18.28 cm3/mol  
38
Adjacent Atomic Numbers
  
  
Previous Element
Molybdenum
  
Americium
  
Next Element
Ruthenium
  
Berkelium
  
Valence Electron Potential
180.00 (-eV)  
3
44.50 (-eV)  
39
Lattice Constant
273.50 pm  
99+
336.25 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.60  
21
1.67  
11
Mechanical
Density
  
  
Density At Room Temperature
11.00 g/cm3  
36
13.51 g/cm3  
26
Density When Liquid (at m.p.)
11.00 g/cm3  
34
13.85 g/cm3  
25
Tensile Strength
50.00 MPa  
38
350.00 MPa  
12
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
99+
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
27.00 GPa  
34
32.00 GPa  
24
Bulk Modulus
100.00 GPa  
16
40.00 GPa  
38
Young's Modulus
50.00 GPa  
39
0.00 GPa  
99+
Poisson Ratio
0.38  
6
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
11.50  
37
13.51  
28
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
200.00 nΩ·m  
18
1.25 nΩ·m  
99+
Electrical Conductivity
0.07 106/cm Ω  
35
0.13 106/cm Ω  
19
Electron Affinity
53.00 kJ/mol  
23
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.21 J/(kg K)  
30
0.10 J/(kg K)  
99+
Molar Heat Capacity
24.27 J/mol·K  
99+
27.50 J/mol·K  
21
Thermal Conductivity
50.60 W/m·K  
30
11.00 W/m·K  
99+
Critical Temperature
2,150.00 K  
16
1,340.00 K  
99+
Thermal Expansion
7.10 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol  
7
331.60 kJ/mol  
40
Enthalpy of Fusion
23.01 kJ/mol  
9
15.00 kJ/mol  
22
Enthalpy of Atomization
649.00 kJ/mol  
9
-  
Standard Molar Entropy
181.10 J/mol.K  
2
52.50 J/mol.K  
36
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