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Curium vs Polonium

Curium
Polonium
Polonium vs Curium


Periodic Table
Symbol
Cm  
Po  
Group Number
3  
15
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
-  
Pm-3m  
Space Group Number
225.00  
3
221.00  
4
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 Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
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 %  
24
0.00 %  
24
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
-  
Aerospace Industry, Ammunition Industry  
Medical Uses
-  
-  
Other Uses
Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
-  
Highly 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
1,340.00 °C  
34
254.00 °C  
99+
Boiling Point
3,110.00 °C  
31
962.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
2.00  
17
2.50  
15
Brinell Hardness
320.00 MPa  
40
70.00 MPa  
99+
Vickers Hardness
461.00 MPa  
37
30.00 MPa  
99+
Speed of Sound
2,260.00 m/s  
99+
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
2.70  
3
Reflectivity
60.00 %  
23
50.00 %  
31
Allotropes
No  
Yes  
α Allotropes
-  
α-polonium  
β Allotropes
-  
β-polonium  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cm  
Po  
Isotopes
  
  
Known Isotopes
15  
24
29  
10
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
2.00  
8
Sanderson Electronegativity
1.30  
25
2.00  
10
Allred Rochow Electronegativity
1.20  
28
1.76  
3
Mulliken-Jaffe Electronegativity
1.30  
33
2.48  
1
Allen Electronegativity
1.30  
40
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+
1,833.20 kJ/mol  
17
3rd Energy Level
2,026.00 kJ/mol  
99+
812.10 kJ/mol  
99+
4th Energy Level
3,550.00 kJ/mol  
99+
8,121.00 kJ/mol  
7
5th Energy Level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
12
6th Energy Level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
32
7th Energy level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
26
8th Energy Level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
26
9th Energy Level
6,690.00 kJ/mol  
37
8,120.00 kJ/mol  
23
10th Energy Level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
27
11th Energy Level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
26
12th Energy Level
58,100.00 kJ/mol  
19
8,120.00 kJ/mol  
99+
13th Energy Level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
19
14th Energy Level
5,810.00 kJ/mol  
40
8,120.00 kJ/mol  
18
15th Energy Level
58,100.00 kJ/mol  
99+
81,200.00 kJ/mol  
15
16th Energy Level
58,100.00 kJ/mol  
99+
81,200.00 kJ/mol  
12
17th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
32
18th Energy Level
5,810.00 kJ/mol  
99+
8,120.00 kJ/mol  
21
19th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
29
20th Energy Level
581.00 kJ/mol  
99+
812.00 kJ/mol  
22
21st Energy Level
5,810.00 kJ/mol  
20
812.10 kJ/mol  
40
22nd Energy Level
581.00 kJ/mol  
99+
812.00 kJ/mol  
17
23rd Energy Level
5,810.00 kJ/mol  
20
812.10 kJ/mol  
99+
24th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
13
25th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
11
26th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
11
27th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
10
28th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
16
29th Energy Level
581.00 kJ/mol  
99+
812.10 kJ/mol  
15
30th Energy Level
581.00 kJ/mol  
99+
812.00 kJ/mol  
11
Electrochemical Equivalent
3.07 g/amp-hr  
19
3.90 g/amp-hr  
8
Electron Work Function
4.50 eV  
19
4.50 eV  
19
Other Chemical Properties
Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Solubility  
Atomic
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  
11
125  
20
Number of Electrons
96  
22
84  
32
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
22
168.00 pm  
25
Covalent Radius
169.00 pm  
28
140.00 pm  
99+
Van der Waals Radius
200.00 pm  
35
197.00 pm  
36
Atomic Weight
247.00 amu  
18
209.00 amu  
28
Atomic Volume
18.28 cm3/mol  
38
22.23 cm3/mol  
22
Adjacent Atomic Numbers
  
  
Previous Element
Americium
  
Bismuth
  
Next Element
Berkelium
  
Francium
  
Valence Electron Potential
44.50 (-eV)  
39
9.30 (-eV)  
99+
Lattice Constant
336.25 pm  
99+
335.90 pm  
99+
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.67  
11
1.46  
99+
Mechanical
Density
  
  
Density At Room Temperature
13.51 g/cm3  
26
9.20 g/cm3  
99+
Density When Liquid (at m.p.)
13.85 g/cm3  
25
9.40 g/cm3  
99+
Tensile Strength
350.00 MPa  
12
50.00 MPa  
38
Viscosity
0.00  
25
0.00  
26
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
24.00 GPa  
40
Bulk Modulus
40.00 GPa  
38
46.00 GPa  
28
Young's Modulus
0.00 GPa  
99+
46.00 GPa  
99+
Poisson Ratio
0.35  
9
0.23  
30
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.51  
28
9.32  
99+
Magnetic Ordering
Antiferromagnetic  
Nonmagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
15
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
1.25 nΩ·m  
99+
0.40 nΩ·m  
99+
Electrical Conductivity
0.13 106/cm Ω  
19
0.02 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
183.30 kJ/mol  
3
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.12 J/(kg K)  
99+
Molar Heat Capacity
27.50 J/mol·K  
21
26.40 J/mol·K  
36
Thermal Conductivity
11.00 W/m·K  
99+
20.00 W/m·K  
99+
Critical Temperature
1,340.00 K  
99+
527.00 K  
99+
Thermal Expansion
11.60 µm/(m·K)  
99+
23.50 µm/(m·K)  
16
Enthalpy
  
  
Enthalpy of Vaporization
331.60 kJ/mol  
40
60.30 kJ/mol  
99+
Enthalpy of Fusion
15.00 kJ/mol  
22
13.00 kJ/mol  
32
Enthalpy of Atomization
-  
134.00 kJ/mol  
99+
Standard Molar Entropy
52.50 J/mol.K  
36
41.10 J/mol.K  
99+
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