Polonium vs Curium
Periodic Table
Symbol
Po
Cm
Group Number
16
2
Not Available
Period Number
6
7
Block
p block
f block
Element Family
Post-Transition
Actinide
CAS Number
7440086
99+
7440519
36
Space Group Name
Pm-3m
Not Available
Space Group Number
221.00
3
Not Available
Facts
Interesting Facts
- 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.
- 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
Pierre Curie and Marie Curie
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Discovery
In 1898
In 1944
Abundance
Abundance In Oceans
0.00 %
99+
Not Available
Uses
Uses & Benefits
- 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.
- Curium metal is used to provide power to electrical equipment for space missions.
Industrial Uses
Aerospace Industry, Ammunition Industry
NA
Medical Uses
NA
NA
Other Uses
Alloys
Research Purposes
Biological Properties
Toxicity
Highly 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
254.00 °C
99+
1,340.00 °C
34
Boiling Point
962.00 °C
99+
3,110.00 °C
30
Appearance
Physical State
Solid
Solid
Color
Silver
Silver
Luster
NA
Metallic
Hardness
Speed of Sound
Not Available
Not Available
Optical Properties
Allotropes
Yes
No
α Allotropes
α-polonium
Not Available
β Allotropes
β-polonium
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Po
Cm
Isotopes
Known Isotopes
29
10
15
24
Electronegativity
Pauling Electronegativity
2.00
7
1.30
32
Allred Rochow Electronegativity
1.76
2
1.20
27
Mulliken-Jaffe Electronegativity
2.48
1
Not Available
Allen Electronegativity
2.19
2
Not Available
Electropositivity
Pauling Electropositivity
2.00
99+
2.70
22
Ionization Energies
1st Energy Level
812.10 kJ/mol
14
581.00 kJ/mol
99+
2nd Energy Level
Not Available
1,196.00 kJ/mol
99+
3rd Energy Level
Not Available
2,026.00 kJ/mol
99+
4th Energy Level
Not Available
3,550.00 kJ/mol
99+
Electrochemical Equivalent
3.90 g/amp-hr
8
3.07 g/amp-hr
16
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
84
32
96
22
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4
[Rn] 5f7 6d1 7s2
Crystal Structure
Monoclinic (MON)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
MON-Crystal-Structure-of-Polonium.jpg#100
DHCP-Crystal-Structure-of-Curium.jpg#100
Atom
Number of Protons
84
32
96
22
Number of Neutrons
125
19
151
10
Number of Electrons
84
32
96
22
Radius of an Atom
Atomic Radius
168.00 pm
23
174.00 pm
20
Covalent Radius
140.00 pm
99+
169.00 pm
26
Van der Waals Radius
197.00 pm
29
200.00 pm
28
Atomic Weight
209.00 amu
28
247.00 amu
18
Atomic Volume
22.23 cm3/mol
13
18.28 cm3/mol
26
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
44.50 (-eV)
38
Lattice Constant
335.90 pm
99+
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
9.20 g/cm3
99+
13.51 g/cm3
25
Density When Liquid (at m.p.)
9.40 g/cm3
19
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
9.32
31
13.51
17
Magnetic Ordering
Nonmagnetic
Antiferromagnetic
Electrical Properties
Electrical Property
Conductor
Unknown
Resistivity
0.40 nΩ·m
99+
1.25 nΩ·m
99+
Electrical Conductivity
0.02 106/cm Ω
99+
Not Available
Electron Affinity
183.30 kJ/mol
3
Not Available
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
Not Available
Molar Heat Capacity
26.40 J/mol·K
28
Not Available
Thermal Conductivity
20.00 W/m·K
99+
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
23.50 µm/(m·K)
16
Not Available
Enthalpy
Enthalpy of Vaporization
60.30 kJ/mol
99+
Not Available
Enthalpy of Fusion
13.00 kJ/mol
26
15.00 kJ/mol
21
Enthalpy of Atomization
134.00 kJ/mol
99+
Not Available
Standard Molar Entropy
Not Available
Not Available
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