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Actinium vs Curium

Actinium
Curium
Curium vs Actinium


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