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Curium vs Polonium

Curium
Polonium
Polonium vs Curium


Periodic Table
Symbol
Cm  
Po  
Group Number
Not Available  
16  
2
Period Number
7  
6  
Block
f block  
p block  
Element Family
Actinide  
Post-​Transition  
CAS Number
7440519  
36
7440086  
99+
Space Group Name
Not Available  
Pm-3m  
Space Group Number
Not Available  
221.00  
3
Facts
Interesting Facts
  • Curium metal does not occur free in nature.
  • Curium metal is a synthetically produced metal.
  
  • Polonium was the first radioactive element to be discovered.
  • Polonium element and its compounds are highly radioactive.
  • Its alloy with Beryllium provides source of neutrons.
  
Sources
Bombarding Plutonium with Helium Ions  
Mining, Ores of metals  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso  
Pierre Curie and Marie Curie  
Discovery
In 1944  
In 1898  
Abundance
  
  
Abundance In Oceans
Not Available  
0.00 %  
99+
Uses
Uses & Benefits
  • Curium metal is used to provide power to electrical equipment for space missions.
  
  • Polonium metal has different Allotropes, it is used in antistatic devices and for research purpose.
  • A 1 gram of Polonium can reach a temperature of 500°C, hence it is used as a heat source for space equipment.
  
Industrial Uses
NA  
Aerospace Industry, Ammunition Industry  
Medical Uses
NA  
NA  
Other Uses
Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
Unknown  
Highly 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
254.00 °C  
99+
Boiling Point
3,110.00 °C  
30
962.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
Metallic  
NA  
Hardness
  
  
Speed of Sound
Not Available  
Not Available  
Optical Properties
  
  
Allotropes
No  
Yes  
α Allotropes
Not Available  
α-polonium  
β Allotropes
Not Available  
β-polonium  
γ Allotropes
Not Available  
Not Available  
Chemical Properties
Chemical Formula
Cm  
Po  
Isotopes
  
  
Known Isotopes
15  
24
29  
10
Electronegativity
  
  
Pauling Electronegativity
1.30  
32
2.00  
7
Allred Rochow Electronegativity
1.20  
27
1.76  
2
Mulliken-Jaffe Electronegativity
Not Available  
2.48  
1
Allen Electronegativity
Not Available  
2.19  
2
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.00  
99+
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
14
2nd Energy Level
1,196.00 kJ/mol  
99+
Not Available  
3rd Energy Level
2,026.00 kJ/mol  
99+
Not Available  
4th Energy Level
3,550.00 kJ/mol  
99+
Not Available  
Electrochemical Equivalent
3.07 g/amp-hr  
16
3.90 g/amp-hr  
8
Electron Work Function
Not Available  
Not Available  
Other Chemical Properties
Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
96  
22
84  
32
Electron Configuration
[Rn] 5f7 6d1 7s2  
[Xe] 4f14 5d10 6s2 6p4  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Monoclinic (MON)  
Crystal Lattice
DHCP-Crystal-Structure-of-Curium.jpg#100  
MON-Crystal-Structure-of-Polonium.jpg#100  
Atom
  
  
Number of Protons
96  
22
84  
32
Number of Neutrons
151  
10
125  
19
Number of Electrons
96  
22
84  
32
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
20
168.00 pm  
23
Covalent Radius
169.00 pm  
26
140.00 pm  
99+
Van der Waals Radius
200.00 pm  
28
197.00 pm  
29
Atomic Weight
247.00 amu  
18
209.00 amu  
28
Atomic Volume
18.28 cm3/mol  
26
22.23 cm3/mol  
13
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Bismuth
  
Next Element
Berkelium
  
Francium
  
Valence Electron Potential
44.50 (-eV)  
38
Not Available  
Lattice Constant
Not Available  
335.90 pm  
99+
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
9.20 g/cm3  
99+
Density When Liquid (at m.p.)
13.85 g/cm3  
10
9.40 g/cm3  
19
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
9.32  
31
Magnetic Ordering
Antiferromagnetic  
Nonmagnetic  
Electrical Properties
  
  
Electrical Property
Unknown  
Conductor  
Resistivity
1.25 nΩ·m  
99+
0.40 nΩ·m  
99+
Electrical Conductivity
Not Available  
0.02 106/cm Ω  
99+
Electron Affinity
Not Available  
183.30 kJ/mol  
3
Thermal Properties
Specific Heat
Not Available  
0.12 J/(kg K)  
40
Molar Heat Capacity
Not Available  
26.40 J/mol·K  
28
Thermal Conductivity
Not Available  
20.00 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
Not Available  
23.50 µm/(m·K)  
16
Enthalpy
  
  
Enthalpy of Vaporization
Not Available  
60.30 kJ/mol  
99+
Enthalpy of Fusion
15.00 kJ/mol  
21
13.00 kJ/mol  
26
Enthalpy of Atomization
Not Available  
134.00 kJ/mol  
99+
Standard Molar Entropy
Not Available  
Not Available  
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