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Cesium
Cesium

Francium
Francium



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Cesium
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Francium

Cesium vs Francium

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1 Periodic Table
1.1 Symbol
Cs
Fr
1.2 Group Number
Tennessine
1
Rank: 17 (Overall)
1
Rank: 17 (Overall)
Gadolinium
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1.3 Period Number
Uranium
6
Rank: 2 (Overall)
7
Rank: 1 (Overall)
Lithium
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1.4 Block
s block
s block
1.5 Element Family
Alkali
Alkali
1.6 CAS Number
Roentgenium
7440462
Rank: 40 (Overall)
7440735
Rank: 18 (Overall)
Aluminium
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1.7 Space Group Name
Im_ 3m
Not Available
1.8 Space Group Number
Sodium
229.00
Rank: 1 (Overall)
Not Available
Rank: N/A (Overall)
Plutonium
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2 Facts
2.1 Interesting Facts
Not Available
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
2.2 Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals
Formed by Decay Process, Mining
2.3 History
2.3.1 Who Discovered
Robert Bunsen and Gustav Kirchhoff
Marguerite Perey
2.3.2 Discovery
In 1860
In 1939
2.4 Abundance
2.4.1 Abundance In Universe
Iron
8 * 10-8 %
Rank: 24 (Overall)
Not Available
Rank: N/A (Overall)
Thallium
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2.4.2 Abundance In Sun
Iron
~0.0000008 %
Rank: 20 (Overall)
~-9999 %
Rank: N/A (Overall)
Beryllium
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2.4.3 Abundance In Meteorites
Iron
0.00 %
Rank: 38 (Overall)
Not Available
Rank: N/A (Overall)
Gold
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2.4.4 Abundance In Earth's Crust
Aluminium
0.00 %
Rank: 35 (Overall)
Not Available
Rank: N/A (Overall)
Radium
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2.4.5 Abundance In Oceans
Sodium
0.00 %
Rank: 17 (Overall)
Not Available
Rank: N/A (Overall)
Protactinium
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2.4.6 Abundance In Humans
Calcium
0.00 %
Rank: 17 (Overall)
Not Available
Rank: N/A (Overall)
Radium
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3 Uses
3.1 Uses & Benefits
  • The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
  • In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
  • Francium has no known uses as it has a half life of only 22 minutes.
3.1.1 Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
NA
3.1.2 Medical Uses
NA
NA
3.1.3 Other Uses
Alloys
NA
3.2 Biological Properties
3.2.1 Toxicity
Mildly Toxic
NA
3.2.2 Present in Human Body
83% Alkali Metals Metals have it !
83% Alkali Metals Metals have it !
3.2.3 In Blood
Sodium
0.00 Blood/mg dm-3
Rank: 28 (Overall)
0.00 Blood/mg dm-3
Rank: 37 (Overall)
Plutonium
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3.2.4 In Bone
Calcium
0.05 p.p.m.
Rank: 26 (Overall)
0.00 p.p.m.
Rank: 36 (Overall)
Plutonium
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4 Physical
4.1 Melting Point
Tungsten
28.50 °C
Rank: 80 (Overall)
27.00 °C
Rank: 81 (Overall)
Francium
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4.2 Boiling Point
Tungsten
678.40 °C
Rank: 75 (Overall)
677.00 °C
Rank: 76 (Overall)
Flerovium
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4.3 Appearance
4.3.1 Physical State
Solid
Solid
4.3.2 Color
Silvery Gold
NA
4.3.3 Luster
NA
NA
4.4 Hardness
4.4.1 Mohs Hardness
Chromium
0.20
Rank: 25 (Overall)
Not Available
Rank: N/A (Overall)
Cesium
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4.4.2 Brinell Hardness
Osmium
0.14 MPa
Rank: 56 (Overall)
Not Available
Rank: N/A (Overall)
Cesium
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4.4.3 Vickers Hardness
Tungsten
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Palladium
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4.5 Speed of Sound
Technetium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Thallium
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4.6 Optical Properties
4.6.1 Refractive Index
Palladium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Mercury
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4.6.2 Reflectivity
Silver
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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4.7 Allotropes
No Alkali Metals Metals has it !
No Alkali Metals Metals has it !
4.7.1 α Allotropes
Not Available
Not Available
4.7.2 β Allotropes
Not Available
Not Available
4.7.3 γ Allotropes
Not Available
Not Available
5 Chemical
5.1 Chemical Formula
Cs
Fr
5.2 Isotopes
5.2.1 Known Isotopes
Palladium
36
Rank: 3 (Overall)
33
Rank: 6 (Overall)
Tennessine
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5.3 Electronegativity
5.3.1 Pauling Electronegativity
Gold
0.79
Rank: 52 (Overall)
0.70
Rank: 53 (Overall)
Francium
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5.3.2 Sanderson Electronegativity
Cobalt
0.22
Rank: 33 (Overall)
Not Available
Rank: N/A (Overall)
Cesium
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5.3.3 Allred Rochow Electronegativity
Gallium
0.86
Rank: 41 (Overall)
0.86
Rank: 41 (Overall)
Cesium
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5.3.4 Mulliken-Jaffe Electronegativity
Polonium
0.62
Rank: 26 (Overall)
0.68
Rank: 25 (Overall)
Cesium
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5.3.5 Allen Electronegativity
Berkelium
0.66
Rank: 48 (Overall)
0.67
Rank: 47 (Overall)
Cesium
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5.4 Electropositivity
5.4.1 Pauling Electropositivity
Francium
3.21
Rank: 2 (Overall)
3.30
Rank: 1 (Overall)
Gold
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5.5 Ionization Energies
5.5.1 1st Energy Level
Chromium
375.70 kJ/mol
Rank: 90 (Overall)
380.00 kJ/mol
Rank: 89 (Overall)
Cesium
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5.5.2 2nd Energy Level
Chromium
2,234.30 kJ/mol
Rank: 8 (Overall)
Not Available
Rank: N/A (Overall)
Ruthenium
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5.5.3 3rd Energy Level
Chromium
3,400.00 kJ/mol
Rank: 16 (Overall)
Not Available
Rank: N/A (Overall)
Osmium
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5.5.4 4th Energy Level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Thorium
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5.5.5 5th Energy Level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Dubnium
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5.5.6 6th Energy Level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Seaborgium
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5.5.7 7th Energy level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Bohrium
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5.5.8 8th Energy Level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Hassium
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5.5.9 9th Energy Level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Yttrium
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5.5.10 10th Energy Level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Strontium
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5.5.11 11th Energy Level
Magnesium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Yttrium
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5.5.12 12th Energy Level
Magnesium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.13 13th Energy Level
Titanium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.14 14th Energy Level
Vanadium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.15 15th Energy Level
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Manganese
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5.5.16 16th Energy Level
Manganese
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Iron
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5.5.17 17th Energy Level
Iron
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Cobalt
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5.5.18 18th Energy Level
Cobalt
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Nickel
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5.5.19 19th Energy Level
Nickel
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Copper
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5.5.20 20th Energy Level
Zinc
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.21 21st Energy Level
Zinc
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.22 22nd Energy Level
Copper
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.23 23rd Energy Level
Copper
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.24 24th Energy Level
Iron
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
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5.5.25 25th Energy Level
Molybdenum
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
5.5.26 26th Energy Level
Molybdenum
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
5.5.27 27th Energy Level
Molybdenum
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
5.5.28 28th Energy Level
Molybdenum
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
5.5.29 29th Energy Level
Molybdenum
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
5.5.30 30th Energy Level
Molybdenum
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Molybdenum
5.6 Electrochemical Equivalent
Francium
4.96 g/amp-hr
Rank: 3 (Overall)
8.32 g/amp-hr
Rank: 1 (Overall)
Beryllium
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5.7 Electron Work Function
Platinum
2.14 eV
Rank: 46 (Overall)
Not Available
Rank: N/A (Overall)
Cesium
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5.8 Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
6 Atomic
6.1 Atomic Number
Tennessine
55
Rank: 61 (Overall)
87
Rank: 31 (Overall)
Lithium
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6.2 Electron Configuration
[Xe] 6s1
[Rn] 7s1
6.3 Crystal Structure
Body Centered Cubic (BCC)
Body Centered Cubic (BCC)
6.3.1 Crystal Lattice
6.4 Atom
6.4.1 Number of Protons
Tennessine
55
Rank: 60 (Overall)
87
Rank: 31 (Overall)
Lithium
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6.4.2 Number of Neutrons
Flerovium
78
Rank: 43 (Overall)
136
Rank: 17 (Overall)
Lithium
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6.4.3 Number of Electrons
Tennessine
55
Rank: 60 (Overall)
87
Rank: 31 (Overall)
Lithium
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6.5 Radius of an Atom
6.5.1 Atomic Radius
Cesium
265.00 pm
Rank: 1 (Overall)
Not Available
Rank: N/A (Overall)
Beryllium
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6.5.2 Covalent Radius
Francium
244.00 pm
Rank: 2 (Overall)
260.00 pm
Rank: 1 (Overall)
Beryllium
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6.5.3 Van der Waals Radius
Francium
343.00 pm
Rank: 2 (Overall)
348.00 pm
Rank: 1 (Overall)
Zinc
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6.6 Atomic Weight
Tennessine
132.91 amu
Rank: 55 (Overall)
223.00 amu
Rank: 27 (Overall)
Lithium
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6.7 Atomic Volume
Cesium
71.07 cm3/mol
Rank: 1 (Overall)
Not Available
Rank: N/A (Overall)
Manganese
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6.8 Adjacent Atomic Numbers
6.8.1 Previous Element
6.8.2 Next Element
6.9 Valence Electron Potential
Platinum
8.62 (-eV)
Rank: 66 (Overall)
8.00 (-eV)
Rank: 67 (Overall)
Francium
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6.10 Lattice Constant
Manganese
614.10 pm
Rank: 5 (Overall)
Not Available
Rank: N/A (Overall)
Beryllium
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6.11 Lattice Angles
π/2, π/2, π/2
NA
6.12 Lattice C/A Ratio
Cadmium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Beryllium
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7 Mechanical
7.1 Density
7.1.1 Density At Room Temperature
Hassium
1.93 g/cm3
Rank: 76 (Overall)
1.87 g/cm3
Rank: 77 (Overall)
Lithium
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7.1.2 Density When Liquid (at m.p.)
Osmium
1.84 g/cm3
Rank: 53 (Overall)
Not Available
Rank: N/A (Overall)
Lithium
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7.2 Tensile Strength
Iron
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Indium
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7.3 Viscosity
Mercury
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Mercury
7.4 Vapor Pressure
7.4.1 Vapor Pressure at 1000 K
Strontium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Cerium
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7.4.2 Vapor Pressure at 2000 K
Chromium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Tungsten
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7.5 Elasticity properties
7.5.1 Shear Modulus
Osmium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Potassium
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7.5.2 Bulk Modulus
Osmium
1.60 GPa
Rank: 50 (Overall)
Not Available
Rank: N/A (Overall)
Cesium
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7.5.3 Young's Modulus
Iridium
1.70 GPa
Rank: 58 (Overall)
Not Available
Rank: N/A (Overall)
Cesium
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7.6 Poisson Ratio
Gallium
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Beryllium
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7.7 Other Mechanical Properties
Ductile
NA
8 Magnetic
8.1 Magnetic Characteristics
8.1.1 Specific Gravity
Cobalt
1.87
Rank: 64 (Overall)
Not Available
Rank: N/A (Overall)
Lithium
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8.1.2 Magnetic Ordering
Paramagnetic
Paramagnetic
8.1.3 Permeability
Iron
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Bismuth
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8.1.4 Susceptibility
Iron
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Bismuth
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8.2 Electrical Properties
8.2.1 Electrical Property
Semiconductor
Poor Conductor
8.2.2 Resistivity
Mercury
205.00 nΩ·m
Rank: 17 (Overall)
3.00 nΩ·m
Rank: 52 (Overall)
Thallium
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8.2.3 Electrical Conductivity
Silver
0.05 106/cm Ω
Rank: 35 (Overall)
0.03 106/cm Ω
Rank: 40 (Overall)
Plutonium
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8.2.4 Electron Affinity
Gold
45.50 kJ/mol
Rank: 25 (Overall)
Not Available
Rank: N/A (Overall)
Mercury
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9 Thermal
9.1 Specific Heat
Lithium
0.24 J/(kg K)
Rank: 23 (Overall)
Not Available
Rank: N/A (Overall)
Americium
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9.2 Molar Heat Capacity
Americium
32.21 J/mol·K
Rank: 4 (Overall)
Not Available
Rank: N/A (Overall)
Beryllium
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9.3 Thermal Conductivity
Silver
35.90 W/m·K
Rank: 36 (Overall)
15.00 W/m·K
Rank: 54 (Overall)
Neptunium
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9.4 Critical Temperature
Lithium
1,938.00 K
Rank: 5 (Overall)
Not Available
Rank: N/A (Overall)
Ytterbium
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9.5 Thermal Expansion
Cesium
97.00 µm/(m·K)
Rank: 1 (Overall)
Not Available
Rank: N/A (Overall)
Tungsten
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9.6 Enthalpy
9.6.1 Enthalpy of Vaporization
Tungsten
65.90 kJ/mol
Rank: 57 (Overall)
Not Available
Rank: N/A (Overall)
Zinc
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9.6.2 Enthalpy of Fusion
Tungsten
2.10 kJ/mol
Rank: 63 (Overall)
Not Available
Rank: N/A (Overall)
Cesium
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9.6.3 Enthalpy of Atomization
Tungsten
78.20 kJ/mol
Rank: 60 (Overall)
71.00 kJ/mol
Rank: 61 (Overall)
Mercury
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9.7 Standard Molar Entropy
Protactinium
85.20 J/mol.K
Rank: 3 (Overall)
Not Available
Rank: N/A (Overall)
Beryllium
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