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Curium Actinium Comparison

Curium
Actinium
Actinium Curium comparison


Periodic Table
Symbol
Cm   
Ac   
Group Number
Not Available   
Not Available   
Period Number
7   
7   
Block
f block   
f block   
Element Family
Actinide   
Actinide   
CAS Number
7440519   
36
7440348   
99+
Space Group Name
Not Available   
Fm_ 3m   
Space Group Number
Not Available   
225.00   
2
Facts
Interesting Facts
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Not Available   
Sources
Bombarding Plutonium with Helium Ions   
Obtained by Treating Radium with Neutrons, Ores of metals   
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso   
Friedrich Oskar Giesel   
Discovery
In 1944   
In 1902   
Abundance
  
  
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Research Purposes   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Unknown   
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
1,340.00 °C   
34
1,227.00 °C   
38
Boiling Point
3,110.00 °C   
30
3,200.00 °C   
26
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
Metallic   
NA   
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
Cm   
Ac   
Isotopes
  
  
Known Isotopes
15   
24
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.10   
99+
Allred Rochow Electronegativity
1.20   
27
1.00   
36
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.90   
10
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
499.00 kJ/mol   
99+
2nd Energy Level
1,196.00 kJ/mol   
99+
1,170.00 kJ/mol   
99+
3rd Energy Level
2,026.00 kJ/mol   
99+
1,900.00 kJ/mol   
99+
4th Energy Level
3,550.00 kJ/mol   
99+
4,700.00 kJ/mol   
23
Electrochemical Equivalent
3.07 g/amp-hr   
16
2.82 g/amp-hr   
18
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
96   
22
89   
29
Electron Configuration
[Rn] 5f7 6d1 7s2   
[Rn] 6d1 7s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Face Centered Cubic (FCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100   
FCC-Crystal-Structure-of-Actinium.jpg#100   
Atom
  
  
Number of Protons
96   
22
89   
29
Number of Neutrons
151   
10
138   
16
Number of Electrons
96   
22
89   
29
Radius of an Atom
  
  
Atomic Radius
174.00 pm   
20
195.00 pm   
7
Covalent Radius
169.00 pm   
26
Not Available   
Van der Waals Radius
200.00 pm   
28
Not Available   
Atomic Weight
247.00 amu   
18
227.00 amu   
25
Atomic Volume
18.28 cm3/mol   
26
22.54 cm3/mol   
11
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Radium
  
Next Element
Berkelium
  
Thorium
  
Valence Electron Potential
44.50 (-eV)   
38
38.60 (-eV)   
99+
Lattice Constant
Not Available   
567.00 pm   
8
Lattice Angles
NA   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
13.51 g/cm3   
25
10.00 g/cm3   
37
Density When Liquid (at m.p.)
13.85 g/cm3   
10
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.51   
17
10.07   
28
Magnetic Ordering
Antiferromagnetic   
Paramagnetic   
Electrical Properties
  
  
Resistivity
1.25 nΩ·m   
99+
Not Available   
Thermal Properties
Specific Heat
Not Available   
0.12 J/(kg K)   
40
Molar Heat Capacity
Not Available   
27.20 J/mol·K   
18
Thermal Conductivity
Not Available   
12.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
15.00 kJ/mol   
21
Not Available   
Enthalpy of Atomization
Not Available   
301.00 kJ/mol   
36
Standard Molar Entropy
Not Available   
56.50 J/mol.K   
25
Summary >>
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