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Radium vs Curium

Radium
Curium
Curium vs Radium


Periodic Table
Symbol
Ra  
Cm  
Group Number
2  
16
3  
15
Period Number
7  
7  
Block
s block  
f block  
Element Family
Alkaline Earth  
Actinide  
CAS Number
7440144  
99+
7440519  
36
Space Group Name
Im_ 3m  
-  
Space Group Number
229.00  
2
225.00  
3
Facts
Interesting Facts
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
Sources
Mining, Ores of metals  
Bombarding Plutonium with Helium Ions  
History
  
  
Who Discovered
-  
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Discovery
In 1898  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
35
Abundance In Sun
0.00 %  
26
0.00 %  
30
Abundance In Meteorites
-  
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 %  
23
0.00 %  
24
Uses
Uses & Benefits
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
  • Curium metal is used to provide power to electrical equipment for space missions.
  
Industrial Uses
-  
-  
Medical Uses
Pharmaceutical Industry  
-  
Other Uses
-  
Research Purposes  
Biological Properties
  
  
Toxicity
Highly Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
34
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
700.00 °C  
99+
1,340.00 °C  
34
Boiling Point
1,737.00 °C  
99+
3,110.00 °C  
31
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
1.00  
22
2.00  
17
Brinell Hardness
700.00 MPa  
17
320.00 MPa  
40
Vickers Hardness
140.00 MPa  
99+
461.00 MPa  
37
Speed of Sound
3,150.00 m/s  
37
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.00  
99+
1.30  
99+
Reflectivity
83.00 %  
6
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ra  
Cm  
Isotopes
  
  
Known Isotopes
33  
6
15  
24
Electronegativity
  
  
Pauling Electronegativity
0.90  
99+
1.30  
33
Sanderson Electronegativity
0.89  
99+
1.30  
25
Allred Rochow Electronegativity
0.97  
39
1.20  
28
Mulliken-Jaffe Electronegativity
0.92  
99+
1.30  
33
Allen Electronegativity
0.89  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
3.10  
5
2.70  
22
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
2nd Energy Level
979.00 kJ/mol  
99+
1,196.00 kJ/mol  
99+
3rd Energy Level
509.30 kJ/mol  
99+
2,026.00 kJ/mol  
99+
4th Energy Level
5,093.00 kJ/mol  
27
3,550.00 kJ/mol  
99+
5th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
6th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
7th Energy level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
8th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
6,690.00 kJ/mol  
37
10th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
11th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
12th Energy Level
5,090.00 kJ/mol  
99+
58,100.00 kJ/mol  
19
13th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
14th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
40
15th Energy Level
50,900.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
16th Energy Level
50,900.00 kJ/mol  
99+
58,100.00 kJ/mol  
99+
17th Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
18th Energy Level
5,090.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
19th Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
20th Energy Level
509.00 kJ/mol  
99+
581.00 kJ/mol  
99+
21st Energy Level
509.30 kJ/mol  
99+
5,810.00 kJ/mol  
20
22nd Energy Level
509.00 kJ/mol  
99+
581.00 kJ/mol  
99+
23rd Energy Level
509.30 kJ/mol  
99+
5,810.00 kJ/mol  
20
24th Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
25th Energy Level
509.00 kJ/mol  
99+
581.00 kJ/mol  
99+
26th Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
27th Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
28th Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
29th Energy Level
509.30 kJ/mol  
99+
581.00 kJ/mol  
99+
30th Energy Level
509.00 kJ/mol  
99+
581.00 kJ/mol  
99+
Electrochemical Equivalent
4.22 g/amp-hr  
6
3.07 g/amp-hr  
19
Electron Work Function
4.30 eV  
25
4.50 eV  
19
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes  
Atomic
Atomic Number
88  
30
96  
22
Electron Configuration
[Rn] 7s2  
[Rn] 5f7 6d1 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
DHCP-Crystal-Structure-of-Curium.jpg#100  
Atom
  
  
Number of Protons
88  
30
96  
22
Number of Neutrons
138  
17
151  
11
Number of Electrons
88  
30
96  
22
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
174.00 pm  
22
Covalent Radius
221.00 pm  
3
169.00 pm  
28
Van der Waals Radius
283.00 pm  
5
200.00 pm  
35
Atomic Weight
226.00 amu  
26
247.00 amu  
18
Atomic Volume
45.20 cm3/mol  
5
18.28 cm3/mol  
38
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Americium
  
Next Element
Actinium
  
Berkelium
  
Valence Electron Potential
20.10 (-eV)  
99+
44.50 (-eV)  
39
Lattice Constant
514.80 pm  
15
336.25 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.57  
99+
1.67  
11
Mechanical
Density
  
  
Density At Room Temperature
5.50 g/cm3  
99+
13.51 g/cm3  
26
Density When Liquid (at m.p.)
5.50 g/cm3  
99+
13.85 g/cm3  
25
Tensile Strength
40.00 MPa  
99+
350.00 MPa  
12
Viscosity
0.00  
2
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
16
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
33
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
32.00 GPa  
24
Bulk Modulus
43.00 GPa  
33
40.00 GPa  
38
Young's Modulus
83.00 GPa  
25
0.00 GPa  
99+
Poisson Ratio
0.31  
13
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
5.00  
99+
13.51  
28
Magnetic Ordering
Nonmagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
18
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
100.00 nΩ·m  
31
1.25 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.13 106/cm Ω  
19
Electron Affinity
0.90 kJ/mol  
99+
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
20.05 J/mol·K  
99+
27.50 J/mol·K  
21
Thermal Conductivity
18.60 W/m·K  
99+
11.00 W/m·K  
99+
Critical Temperature
973.00 K  
99+
1,340.00 K  
99+
Thermal Expansion
8.50 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
113.00 kJ/mol  
99+
331.60 kJ/mol  
40
Enthalpy of Fusion
8.60 kJ/mol  
99+
15.00 kJ/mol  
22
Enthalpy of Atomization
163.00 kJ/mol  
99+
-  
Standard Molar Entropy
71.00 J/mol.K  
14
52.50 J/mol.K  
36
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