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Einsteinium


Periodic Table
Symbol
Es
Group Number
13 5
Period Number
7 1
Block
f block
Element Family
Actinide
CAS Number
7429927 90
Space Group Name
-
Space Group Number
194.00 7
Facts
Interesting Facts
  • Einsteinium is the transuranic element found in US.
  • Only 0.01 mg of Einsteinium was synthesized in 1961.
Sources
Made by Bombarding Uranium with Neutrons
History
Who Discovered
Lawrence Berkeley National Laboratory
Discovery
In 1952
Abundance
Abundance In Universe
0.00 % 35
Abundance In Sun
0.00 % 30
Abundance In Meteorites
0.00 % 54
Abundance In Earth's Crust
0.00 % 60
Abundance In Oceans
-
Abundance In Humans
0.00 % 24
Uses
Uses & Benefits
  • Currently known uses of Einsteinium metal are limited to research purpose only.
Industrial Uses
-
Medical Uses
-
Other Uses
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Toxic
Present in Human Body
No
In Blood
0.00 Blood/mg dm-3 40
In Bone
0.00 p.p.m. 41
Physical
Melting Point
860.00 °C 51
Boiling Point
996.00 °C 70
Appearance
Physical State
Solid
Color
Silver
Luster
-
Hardness
Mohs Hardness
6.00 6
Brinell Hardness
240.00 MPa 46
Vickers Hardness
550.00 MPa 31
Speed of Sound
2,850.00 m/s 40
Optical Properties
Refractive Index
1.30 43
Reflectivity
63.00 % 20
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Es
Isotopes
Known Isotopes
16 23
Electronegativity
Pauling Electronegativity
1.54 27
Sanderson Electronegativity
1.30 25
Allred Rochow Electronegativity
1.20 28
Mulliken-Jaffe Electronegativity
1.30 33
Allen Electronegativity
1.30 40
Electropositivity
Pauling Electropositivity
2.70 22
Ionization Energies
1st Energy Level
619.00 kJ/mol 48
2nd Energy Level
1,216.00 kJ/mol 60
3rd Energy Level
2,334.00 kJ/mol 56
4th Energy Level
3,734.00 kJ/mol 58
5th Energy Level
6,190.00 kJ/mol 40
6th Energy Level
6,190.00 kJ/mol 54
7th Energy level
6,190.00 kJ/mol 48
8th Energy Level
6,190.00 kJ/mol 46
9th Energy Level
4,520.00 kJ/mol 80
10th Energy Level
6,190.00 kJ/mol 44
11th Energy Level
6,190.00 kJ/mol 49
12th Energy Level
61,900.00 kJ/mol 12
13th Energy Level
6,190.00 kJ/mol 39
14th Energy Level
6,190.00 kJ/mol 28
15th Energy Level
61,900.00 kJ/mol 40
16th Energy Level
61,900.00 kJ/mol 30
17th Energy Level
619.00 kJ/mol 50
18th Energy Level
6,190.00 kJ/mol 41
19th Energy Level
619.00 kJ/mol 47
20th Energy Level
619.00 kJ/mol 44
21st Energy Level
6,190.00 kJ/mol 15
22nd Energy Level
619.00 kJ/mol 38
23rd Energy Level
6,190.00 kJ/mol 15
24th Energy Level
619.40 kJ/mol 40
25th Energy Level
619.00 kJ/mol 41
26th Energy Level
619.40 kJ/mol 40
27th Energy Level
619.40 kJ/mol 42
28th Energy Level
619.40 kJ/mol 47
29th Energy Level
619.40 kJ/mol 48
30th Energy Level
619.40 kJ/mol 44
Electrochemical Equivalent
4.74 g/amp-hr 5
Electron Work Function
4.90 eV 12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Atomic
Atomic Number
99 19
Electron Configuration
[Rn] 5f11 7s2
Crystal Structure
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Einsteinium.jpg#100
Atom
Number of Protons
99 19
Number of Neutrons
153 10
Number of Electrons
99 19
Radius of an Atom
Atomic Radius
186.00 pm 11
Covalent Radius
186.00 pm 21
Van der Waals Radius
0.00 pm 53
Atomic Weight
252.00 amu 16
Atomic Volume
17.04 cm3/mol 46
Adjacent Atomic Numbers
Previous Element
51
Next Element
88
Valence Electron Potential
0.00 (-eV) 78
Lattice Constant
582.00 pm 8
Lattice Angles
-
Lattice C/A Ratio
1.29 57
Mechanical
Density
Density At Room Temperature
8.84 g/cm3 50
Density When Liquid (at m.p.)
8.84 g/cm3 49
Tensile Strength
0.10 MPa 52
Viscosity
0.00 25
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa) 22
Vapor Pressure at 2000 K
0.00 (Pa) 24
Elasticity properties
Shear Modulus
30.00 GPa 27
Bulk Modulus
40.00 GPa 38
Young's Modulus
0.00 GPa 74
Poisson Ratio
0.33 11
Other Mechanical Properties
-
Magnetic
Magnetic Characteristics
Specific Gravity
8.84 50
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m 17
Susceptibility
0.00 24
Electrical Properties
Electrical Property
-
Resistivity
6.30 nΩ·m 59
Electrical Conductivity
0.14 106/cm Ω 15
Electron Affinity
0.00 kJ/mol 49
Thermal
Specific Heat
0.10 J/(kg K) 44
Molar Heat Capacity
27.20 J/mol·K 24
Thermal Conductivity
0.00 W/m·K 80
Critical Temperature
1,133.00 K 54
Thermal Expansion
13.50 µm/(m·K) 33
Enthalpy
Enthalpy of Vaporization
323.80 kJ/mol 43
Enthalpy of Fusion
14.80 kJ/mol 24
Enthalpy of Atomization
-
Standard Molar Entropy
63.00 J/mol.K 24
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