Einsteinium vs Curium
Periodic Table
Symbol
Es
Cm
Group Number
Not Available
Not Available
Period Number
7
7
Block
f block
f block
Element Family
Actinide
Actinide
CAS Number
7429927
99+
7440519
36
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Einsteinium is the transuranic element found in US.
- Only 0.01 mg of Einsteinium was synthesized in 1961.
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
Sources
Made by Bombarding Uranium with Neutrons
Bombarding Plutonium with Helium Ions
History
Who Discovered
Lawrence Berkeley National Laboratory
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Discovery
In 1952
In 1944
Abundance
Uses
Uses & Benefits
- Currently known uses of Einsteinium metal are limited to research purpose only.
- Curium metal is used to provide power to electrical equipment for space missions.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
Alloys, Nuclear Research, Research Purposes
Research Purposes
Biological Properties
Toxicity
Toxic
Unknown
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
860.00 °C
99+
1,340.00 °C
34
Boiling Point
996.00 °C
99+
3,110.00 °C
30
Appearance
Physical State
Solid
Solid
Color
Silver
Silver
Luster
NA
Metallic
Hardness
Speed of Sound
Not Available
Not Available
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
Es
Cm
Isotopes
Known Isotopes
16
23
15
24
Electronegativity
Pauling Electronegativity
1.54
26
1.30
32
Allred Rochow Electronegativity
1.20
27
1.20
27
Electropositivity
Pauling Electropositivity
2.70
22
2.70
22
Ionization Energies
1st Energy Level
619.00 kJ/mol
99+
581.00 kJ/mol
99+
2nd Energy Level
1,216.00 kJ/mol
99+
1,196.00 kJ/mol
99+
3rd Energy Level
2,334.00 kJ/mol
99+
2,026.00 kJ/mol
99+
4th Energy Level
3,734.00 kJ/mol
99+
3,550.00 kJ/mol
99+
Electrochemical Equivalent
4.74 g/amp-hr
5
3.07 g/amp-hr
16
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
99
19
96
22
Electron Configuration
[Rn] 5f11 7s2
[Rn] 5f7 6d1 7s2
Crystal Structure
Face Centered Cubic (FCC)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
FCC-Crystal-Structure-of-Einsteinium.jpg#100
DHCP-Crystal-Structure-of-Curium.jpg#100
Atom
Number of Protons
99
19
96
22
Number of Neutrons
153
9
151
10
Number of Electrons
99
19
96
22
Radius of an Atom
Atomic Radius
186.00 pm
9
174.00 pm
20
Covalent Radius
Not Available
169.00 pm
26
Van der Waals Radius
Not Available
200.00 pm
28
Atomic Weight
252.00 amu
16
247.00 amu
18
Atomic Volume
Not Available
18.28 cm3/mol
26
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
44.50 (-eV)
38
Lattice Constant
Not Available
Not Available
Lattice Angles
NA
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
8.84 g/cm3
99+
13.51 g/cm3
25
Density When Liquid (at m.p.)
Not Available
13.85 g/cm3
10
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
13.51
17
Magnetic Ordering
Paramagnetic
Antiferromagnetic
Electrical Properties
Resistivity
Not Available
1.25 nΩ·m
99+
Thermal Properties
Specific Heat
Not Available
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
Not Available
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Fusion
Not Available
15.00 kJ/mol
21
Standard Molar Entropy
Not Available
Not Available
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