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Californium Technetium Comparison

Californium
Technetium
Technetium Californium comparison


Periodic Table
Symbol
Cf   
Tc   
Group Number
Not Available   
7   
11
Period Number
7   
5   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7440713   
20
7440268   
99+
Space Group Name
P63/mmc   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
Facts
Interesting Facts
  • Californium metal is very harmful and highly radioactive.
  • Californium metal is the heaviest metal.
  
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Made by Bombarding Curium with Helium Ions   
Made by Bombarding Molybdenum with Deuterons   
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory   
Emilio Segrè and Carlo Perriero   
Discovery
In 1950   
In 1937   
Abundance
  
  
Uses
Uses & Benefits
  • Californium metal has a very strong neutron emitter. It is used as a metal detector.
  • It also used as an identifier to check Water and oil layers in oil wells.
  
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
Industrial Uses
Chemical Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Toxic   
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
900.00 °C   
99+
2,200.00 °C   
9
Boiling Point
1,470.00 °C   
99+
4,877.00 °C   
7
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Shiny Gray   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
3.00   
12
Not Available   
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
Cf   
Tc   
Isotopes
  
  
Known Isotopes
20   
19
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
608.00 kJ/mol   
99+
702.00 kJ/mol   
36
2nd Energy Level
1,206.00 kJ/mol   
99+
1,470.00 kJ/mol   
99+
3rd Energy Level
2,267.00 kJ/mol   
99+
2,850.00 kJ/mol   
33
4th Energy Level
3,599.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
3.12 g/amp-hr   
15
0.52 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
98   
20
43   
99+
Electron Configuration
[Rn] 5f10 7s2   
[Kr] 4d5 5s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Californium.jpg#100   
HCP-Crystal-Structure-of-Technetium.jpg#100   
Atom
  
  
Number of Protons
98   
20
43   
99+
Number of Neutrons
153   
9
55   
99+
Number of Electrons
98   
20
43   
99+
Radius of an Atom
  
  
Atomic Radius
186.00 pm   
9
136.00 pm   
99+
Covalent Radius
Not Available   
147.00 pm   
37
Van der Waals Radius
Not Available   
200.00 pm   
28
Atomic Weight
251.00 amu   
17
98.00 amu   
99+
Atomic Volume
Not Available   
8.50 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Berkelium
  
Molybdenum
  
Next Element
Einsteinium
  
Ruthenium
  
Valence Electron Potential
44.50 (-eV)   
38
180.00 (-eV)   
3
Lattice Constant
338.00 pm   
99+
273.50 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
5
Mechanical Properties
Density
  
  
Density At Room Temperature
15.10 g/cm3   
21
11.00 g/cm3   
34
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Malleable, Sectile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.10   
13
11.50   
24
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
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
Not Available   
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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