Home
 Compare Metals

Actinium vs Curium

Actinium
Curium
Curium vs Actinium


Periodic Table
Symbol
Ac  
Cm  
Group Number
3  
15
3  
15
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
7440348  
99+
7440519  
36
Space Group Name
Fm_ 3m  
-  
Space Group Number
225.00  
3
225.00  
3
Facts
Interesting Facts
Actinium glows in the dark due to its radioactivity.  
  • 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
  
  
Abundance In Universe
0.00 %  
34
0.00 %  
35
Abundance In Sun
0.00 %  
26
0.00 %  
30
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
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
-  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Research Purposes  
Biological Properties
  
  
Toxicity
Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,227.00 °C  
38
1,340.00 °C  
34
Boiling Point
3,200.00 °C  
27
3,110.00 °C  
31
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.50  
5
2.00  
17
Brinell Hardness
70.00 MPa  
99+
320.00 MPa  
40
Vickers Hardness
260.00 MPa  
99+
461.00 MPa  
37
Speed of Sound
3,430.00 m/s  
32
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.00  
99+
1.30  
99+
Reflectivity
62.00 %  
21
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ac  
Cm  
Isotopes
  
  
Known Isotopes
29  
10
15  
24
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.30  
33
Sanderson Electronegativity
1.10  
38
1.30  
25
Allred Rochow Electronegativity
1.00  
37
1.20  
28
Mulliken-Jaffe Electronegativity
1.10  
99+
1.30  
33
Allen Electronegativity
1.10  
99+
1.30  
40
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  
33
3,550.00 kJ/mol  
99+
5th Energy Level
4,990.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
6th Energy Level
5,750.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
7th Energy level
5,750.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
8th Energy Level
5,750.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
4,990.00 kJ/mol  
99+
6,690.00 kJ/mol  
37
10th Energy Level
4,990.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
11th Energy Level
4,990.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
12th Energy Level
49,900.00 kJ/mol  
21
58,100.00 kJ/mol  
19
13th Energy Level
4,990.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
14th Energy Level
4,990.00 kJ/mol  
99+
5,810.00 kJ/mol  
40
15th Energy Level
49,900.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
16th Energy Level
49,900.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
17th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
18th Energy Level
4,990.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
19th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
20th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
21st Energy Level
4,990.00 kJ/mol  
25
5,810.00 kJ/mol  
20
22nd Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
23rd Energy Level
4,990.00 kJ/mol  
29
5,810.00 kJ/mol  
20
24th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
25th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
26th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
27th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
28th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
29th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
30th Energy Level
499.00 kJ/mol  
99+
581.00 kJ/mol  
99+
Electrochemical Equivalent
2.82 g/amp-hr  
22
3.07 g/amp-hr  
19
Electron Work Function
4.38 eV  
23
4.50 eV  
19
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes  
Atomic
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  
17
151  
11
Number of Electrons
89  
29
96  
22
Radius of an Atom
  
  
Atomic Radius
195.00 pm  
9
174.00 pm  
22
Covalent Radius
186.00 pm  
21
169.00 pm  
28
Van der Waals Radius
215.00 pm  
31
200.00 pm  
35
Atomic Weight
227.00 amu  
25
247.00 amu  
18
Atomic Volume
22.54 cm3/mol  
20
18.28 cm3/mol  
38
Adjacent Atomic Numbers
  
  
Previous Element
Radium
  
Americium
  
Next Element
Thorium
  
Berkelium
  
Valence Electron Potential
38.60 (-eV)  
99+
44.50 (-eV)  
39
Lattice Constant
567.00 pm  
9
336.25 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.89  
2
1.67  
11
Mechanical
Density
  
  
Density At Room Temperature
10.00 g/cm3  
40
13.51 g/cm3  
26
Density When Liquid (at m.p.)
10.07 g/cm3  
40
13.85 g/cm3  
25
Tensile Strength
65.00 MPa  
33
350.00 MPa  
12
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
32.00 GPa  
24
Bulk Modulus
94.00 GPa  
17
40.00 GPa  
38
Young's Modulus
130.00 GPa  
16
0.00 GPa  
99+
Poisson Ratio
0.34  
10
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.07  
99+
13.51  
28
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
5.20 nΩ·m  
99+
1.25 nΩ·m  
99+
Electrical Conductivity
0.15 106/cm Ω  
13
0.13 106/cm Ω  
19
Electron Affinity
33.20 kJ/mol  
34
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
27.20 J/mol·K  
24
27.50 J/mol·K  
21
Thermal Conductivity
12.00 W/m·K  
99+
11.00 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,340.00 K  
99+
Thermal Expansion
12.10 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
120.00 kJ/mol  
99+
331.60 kJ/mol  
40
Enthalpy of Fusion
14.20 kJ/mol  
28
15.00 kJ/mol  
22
Enthalpy of Atomization
301.00 kJ/mol  
99+
-  
Standard Molar Entropy
56.50 J/mol.K  
33
52.50 J/mol.K  
36
Periodic Table >>
<< All

Compare Actinide Series

Actinide Series

Actinide Series

» More Actinide Series

Compare Actinide Series

» More Compare Actinide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!