Mercury vs Curium
Periodic Table
Symbol
Hg
Cm
Group Number
12
6
Not Available
Period Number
6
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7439976
99+
7440519
36
Space Group Name
R_ 3m
Not Available
Space Group Number
166.00
6
Not Available
Facts
Interesting Facts
- At room temperature mercury is found in a liquid state.
- A coin of pound or rupees floats in mercury.
- Because of its low melting point and boiling point it is used in thermometers.
- Curium metal does not occur free in nature.
- Curium metal is a synthetically produced metal.
Sources
Mining, Ores of Minerals
Bombarding Plutonium with Helium Ions
History
Who Discovered
Ancient Chinese and Indians
Glenn T. Seaborg, Ralph A. James, Albert Ghiorso
Discovery
Before 2000 BCE
In 1944
Abundance
Abundance In Earth's Crust
0.05 %
9
Not Available
Uses
Uses & Benefits
- It is a liquid metal at room temperature, but it is a toxic heavy metal and hence many uses of mercury are under review or phased out.
- It is manly used as a catalysts in chemical industry.
- Curium metal is used to provide power to electrical equipment for space missions.
Industrial Uses
Electrical Industry, Electronic Industry
NA
Medical Uses
Dentistry
NA
Other Uses
Alloys, Mirror Manufacturing, Pharmaceutical Industry
Research Purposes
Biological Properties
Toxicity
Highly Toxic
Unknown
Present in Human Body
Yes
No
In Blood
0.01 Blood/mg dm-3
23
0.00 Blood/mg dm-3
37
In Bone
0.45 p.p.m.
19
0.00 p.p.m.
36
Physical Properties
Melting Point
Not Available
1,340.00 °C
34
Boiling Point
356.58 °C
99+
3,110.00 °C
30
Appearance
Physical State
Liquid
Solid
Color
Silver
Silver
Luster
NA
Metallic
Hardness
Speed of Sound
1,451.40 m/s
99+
Not Available
Optical Properties
Refractive Index
1.00
3
Not Available
Reflectivity
73.00 %
8
Not Available
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Hg
Cm
Isotopes
Known Isotopes
34
5
15
24
Electronegativity
Pauling Electronegativity
2.00
7
1.30
32
Sanderson Electronegativity
2.20
7
Not Available
Allred Rochow Electronegativity
1.44
17
1.20
27
Mulliken-Jaffe Electronegativity
1.81
9
Not Available
Allen Electronegativity
1.44
30
Not Available
Electropositivity
Pauling Electropositivity
2.00
99+
2.70
22
Ionization Energies
1st Energy Level
1,007.10 kJ/mol
4
581.00 kJ/mol
99+
2nd Energy Level
1,810.00 kJ/mol
20
1,196.00 kJ/mol
99+
3rd Energy Level
3,300.00 kJ/mol
20
2,026.00 kJ/mol
99+
4th Energy Level
Not Available
3,550.00 kJ/mol
99+
Electrochemical Equivalent
3.74 g/amp-hr
10
3.07 g/amp-hr
16
Electron Work Function
4.49 eV
15
Not Available
Other Chemical Properties
Flammability, Ionization, Solubility
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
80
36
96
22
Electron Configuration
[Xe] 4f14 5d10 6s2
[Rn] 5f7 6d1 7s2
Crystal Structure
Rhombohedral (RHO)
Double Hexagonal Close Packed (DHCP)
Crystal Lattice
RHO-Crystal-Structure-of-Mercury.jpg#100
DHCP-Crystal-Structure-of-Curium.jpg#100
Atom
Number of Protons
80
36
96
22
Number of Neutrons
121
22
151
10
Number of Electrons
80
36
96
22
Radius of an Atom
Atomic Radius
151.00 pm
32
174.00 pm
20
Covalent Radius
132.00 pm
99+
169.00 pm
26
Van der Waals Radius
155.00 pm
99+
200.00 pm
28
Atomic Weight
200.59 amu
32
247.00 amu
18
Atomic Volume
14.82 cm3/mol
35
18.28 cm3/mol
26
Adjacent Atomic Numbers
Valence Electron Potential
28.20 (-eV)
99+
44.50 (-eV)
38
Lattice Constant
300.50 pm
99+
Not Available
Lattice Angles
NA
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
13.53 g/cm3
24
13.51 g/cm3
25
Density When Liquid (at m.p.)
Not Available
13.85 g/cm3
10
Tensile Strength
Not Available
Not Available
Viscosity
0.00
1
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Unknown
Magnetic Properties
Magnetic Characteristics
Specific Gravity
13.53
16
13.51
17
Magnetic Ordering
Diamagnetic
Antiferromagnetic
Electrical Properties
Electrical Property
Conductor
Unknown
Resistivity
961.00 nΩ·m
1
1.25 nΩ·m
99+
Electrical Conductivity
0.01 106/cm Ω
99+
Not Available
Electron Affinity
0.00 kJ/mol
40
Not Available
Thermal Properties
Specific Heat
0.14 J/(kg K)
38
Not Available
Molar Heat Capacity
27.98 J/mol·K
13
Not Available
Thermal Conductivity
8.30 W/m·K
99+
Not Available
Critical Temperature
1,750.00 K
6
Not Available
Thermal Expansion
60.40 µm/(m·K)
5
Not Available
Enthalpy
Enthalpy of Vaporization
56.90 kJ/mol
99+
Not Available
Enthalpy of Fusion
2.29 kJ/mol
99+
15.00 kJ/mol
21
Enthalpy of Atomization
61.50 kJ/mol
99+
Not Available
Standard Molar Entropy
75.80 J/mol.K
6
Not Available
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