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Rubidium
Rubidium

Cesium
Cesium



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Rubidium
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Cesium

Rubidium vs Cesium

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1 Periodic Table
1.1 Symbol
Rb
Cs
1.2 Group Number
Tennessine
1
Rank: 17 (Overall)
1
Rank: 17 (Overall)
Gadolinium
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1.3 Period Number
Uranium
5
Rank: 3 (Overall)
6
Rank: 2 (Overall)
Lithium
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1.4 Block
s block
s block
1.5 Element Family
Alkali
Alkali
1.6 CAS Number
Roentgenium
7440177
Rank: 62 (Overall)
7440462
Rank: 40 (Overall)
Aluminium
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1.7 Space Group Name
Im_ 3m
Im_ 3m
1.8 Space Group Number
Sodium
229.00
Rank: 1 (Overall)
229.00
Rank: 1 (Overall)
Plutonium
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2 Facts
2.1 Interesting Facts
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
Not Available
2.2 Sources
Obtained from Lithium Production.
Earth's crust, Found in Minerals, Mining, Ores of Minerals
2.3 History
2.3.1 Who Discovered
Robert Bunsen and Gustav Kirchhoff
Robert Bunsen and Gustav Kirchhoff
2.3.2 Discovery
In 1861
In 1860
2.4 Abundance
2.4.1 Abundance In Universe
Iron
1 * 10-6 %
Rank: 16 (Overall)
8 * 10-8 %
Rank: 24 (Overall)
Thallium
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2.4.2 Abundance In Sun
Iron
~0.000003 %
Rank: 17 (Overall)
~0.0000008 %
Rank: 20 (Overall)
Beryllium
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2.4.3 Abundance In Meteorites
Iron
0.00 %
Rank: 19 (Overall)
0.00 %
Rank: 38 (Overall)
Gold
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2.4.4 Abundance In Earth's Crust
Aluminium
0.01 %
Rank: 18 (Overall)
0.00 %
Rank: 35 (Overall)
Radium
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2.4.5 Abundance In Oceans
Sodium
0.00 %
Rank: 7 (Overall)
0.00 %
Rank: 17 (Overall)
Protactinium
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2.4.6 Abundance In Humans
Calcium
0.00 %
Rank: 7 (Overall)
0.00 %
Rank: 17 (Overall)
Radium
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3 Uses
3.1 Uses & Benefits
  • Rubidium's main application is in the glass manufacturing.
  • Rubidium can very easily get ionized and hence it is used for ion engines, but it is still less efficient than that of Caesium.
  • 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.
3.1.1 Industrial Uses
NA
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
3.1.2 Medical Uses
NA
NA
3.1.3 Other Uses
Alloys, Research Purposes
Alloys
3.2 Biological Properties
3.2.1 Toxicity
Non Toxic
Mildly Toxic
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
2.49 Blood/mg dm-3
Rank: 7 (Overall)
0.00 Blood/mg dm-3
Rank: 28 (Overall)
Plutonium
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3.2.4 In Bone
Calcium
5.00 p.p.m.
Rank: 13 (Overall)
0.05 p.p.m.
Rank: 26 (Overall)
Plutonium
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4 Physical
4.1 Melting Point
Tungsten
38.89 °C
Rank: 78 (Overall)
28.50 °C
Rank: 80 (Overall)
Francium
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4.2 Boiling Point
Tungsten
688.00 °C
Rank: 74 (Overall)
678.40 °C
Rank: 75 (Overall)
Flerovium
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4.3 Appearance
4.3.1 Physical State
Solid
Solid
4.3.2 Color
Grayish White
Silvery Gold
4.3.3 Luster
NA
NA
4.4 Hardness
4.4.1 Mohs Hardness
Chromium
0.30
Rank: 24 (Overall)
0.20
Rank: 25 (Overall)
Cesium
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4.4.2 Brinell Hardness
Osmium
0.22 MPa
Rank: 55 (Overall)
0.14 MPa
Rank: 56 (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
1,300.00 m/s
Rank: 50 (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
Rb
Cs
5.2 Isotopes
5.2.1 Known Isotopes
Palladium
29
Rank: 10 (Overall)
36
Rank: 3 (Overall)
Tennessine
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5.3 Electronegativity
5.3.1 Pauling Electronegativity
Gold
0.82
Rank: 51 (Overall)
0.79
Rank: 52 (Overall)
Francium
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5.3.2 Sanderson Electronegativity
Cobalt
0.31
Rank: 32 (Overall)
0.22
Rank: 33 (Overall)
Cesium
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5.3.3 Allred Rochow Electronegativity
Gallium
0.89
Rank: 40 (Overall)
0.86
Rank: 41 (Overall)
Cesium
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5.3.4 Mulliken-Jaffe Electronegativity
Polonium
0.69
Rank: 24 (Overall)
0.62
Rank: 26 (Overall)
Cesium
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5.3.5 Allen Electronegativity
Berkelium
0.71
Rank: 46 (Overall)
0.66
Rank: 48 (Overall)
Cesium
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5.4 Electropositivity
5.4.1 Pauling Electropositivity
Francium
3.18
Rank: 3 (Overall)
3.21
Rank: 2 (Overall)
Gold
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5.5 Ionization Energies
5.5.1 1st Energy Level
Chromium
403.00 kJ/mol
Rank: 88 (Overall)
375.70 kJ/mol
Rank: 90 (Overall)
Cesium
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5.5.2 2nd Energy Level
Chromium
2,633.00 kJ/mol
Rank: 6 (Overall)
2,234.30 kJ/mol
Rank: 8 (Overall)
Ruthenium
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5.5.3 3rd Energy Level
Chromium
3,860.00 kJ/mol
Rank: 11 (Overall)
3,400.00 kJ/mol
Rank: 16 (Overall)
Osmium
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5.5.4 4th Energy Level
Chromium
5,080.00 kJ/mol
Rank: 18 (Overall)
Not Available
Rank: N/A (Overall)
Thorium
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5.5.5 5th Energy Level
Chromium
6,850.00 kJ/mol
Rank: 19 (Overall)
Not Available
Rank: N/A (Overall)
Dubnium
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5.5.6 6th Energy Level
Chromium
8,140.00 kJ/mol
Rank: 20 (Overall)
Not Available
Rank: N/A (Overall)
Seaborgium
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5.5.7 7th Energy level
Chromium
9,570.00 kJ/mol
Rank: 20 (Overall)
Not Available
Rank: N/A (Overall)
Bohrium
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5.5.8 8th Energy Level
Chromium
13,120.00 kJ/mol
Rank: 17 (Overall)
Not Available
Rank: N/A (Overall)
Hassium
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5.5.9 9th Energy Level
Chromium
14,500.00 kJ/mol
Rank: 18 (Overall)
Not Available
Rank: N/A (Overall)
Yttrium
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5.5.10 10th Energy Level
Chromium
26,740.00 kJ/mol
Rank: 6 (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
3.19 g/amp-hr
Rank: 14 (Overall)
4.96 g/amp-hr
Rank: 3 (Overall)
Beryllium
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5.7 Electron Work Function
Platinum
2.16 eV
Rank: 45 (Overall)
2.14 eV
Rank: 46 (Overall)
Cesium
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5.8 Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility
6 Atomic
6.1 Atomic Number
Tennessine
37
Rank: 75 (Overall)
55
Rank: 61 (Overall)
Lithium
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6.2 Electron Configuration
[Kr] 5s1
[Xe] 6s1
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
37
Rank: 74 (Overall)
55
Rank: 60 (Overall)
Lithium
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6.4.2 Number of Neutrons
Flerovium
48
Rank: 56 (Overall)
78
Rank: 43 (Overall)
Lithium
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6.4.3 Number of Electrons
Tennessine
37
Rank: 74 (Overall)
55
Rank: 60 (Overall)
Lithium
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6.5 Radius of an Atom
6.5.1 Atomic Radius
Cesium
248.00 pm
Rank: 2 (Overall)
265.00 pm
Rank: 1 (Overall)
Beryllium
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6.5.2 Covalent Radius
Francium
220.00 pm
Rank: 4 (Overall)
244.00 pm
Rank: 2 (Overall)
Beryllium
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6.5.3 Van der Waals Radius
Francium
303.00 pm
Rank: 3 (Overall)
343.00 pm
Rank: 2 (Overall)
Zinc
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6.6 Atomic Weight
Tennessine
85.47 amu
Rank: 69 (Overall)
132.91 amu
Rank: 55 (Overall)
Lithium
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6.7 Atomic Volume
Cesium
55.90 cm3/mol
Rank: 2 (Overall)
71.07 cm3/mol
Rank: 1 (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
9.47 (-eV)
Rank: 65 (Overall)
8.62 (-eV)
Rank: 66 (Overall)
Francium
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6.10 Lattice Constant
Manganese
558.50 pm
Rank: 10 (Overall)
614.10 pm
Rank: 5 (Overall)
Beryllium
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6.11 Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
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
1.53 g/cm3
Rank: 81 (Overall)
1.93 g/cm3
Rank: 76 (Overall)
Lithium
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7.1.2 Density When Liquid (at m.p.)
Osmium
1.46 g/cm3
Rank: 56 (Overall)
1.84 g/cm3
Rank: 53 (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
2.50 GPa
Rank: 49 (Overall)
1.60 GPa
Rank: 50 (Overall)
Cesium
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7.5.3 Young's Modulus
Iridium
2.40 GPa
Rank: 57 (Overall)
1.70 GPa
Rank: 58 (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
Ductile
8 Magnetic
8.1 Magnetic Characteristics
8.1.1 Specific Gravity
Cobalt
1.53
Rank: 67 (Overall)
1.87
Rank: 64 (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
Conductor
Semiconductor
8.2.2 Resistivity
Mercury
128.00 nΩ·m
Rank: 26 (Overall)
205.00 nΩ·m
Rank: 17 (Overall)
Thallium
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8.2.3 Electrical Conductivity
Silver
0.08 106/cm Ω
Rank: 24 (Overall)
0.05 106/cm Ω
Rank: 35 (Overall)
Plutonium
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8.2.4 Electron Affinity
Gold
46.90 kJ/mol
Rank: 24 (Overall)
45.50 kJ/mol
Rank: 25 (Overall)
Mercury
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9 Thermal
9.1 Specific Heat
Lithium
0.36 J/(kg K)
Rank: 17 (Overall)
0.24 J/(kg K)
Rank: 23 (Overall)
Americium
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9.2 Molar Heat Capacity
Americium
31.06 J/mol·K
Rank: 5 (Overall)
32.21 J/mol·K
Rank: 4 (Overall)
Beryllium
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9.3 Thermal Conductivity
Silver
58.20 W/m·K
Rank: 26 (Overall)
35.90 W/m·K
Rank: 36 (Overall)
Neptunium
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9.4 Critical Temperature
Lithium
2,093.00 K
Rank: 4 (Overall)
1,938.00 K
Rank: 5 (Overall)
Ytterbium
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9.5 Thermal Expansion
Cesium
90.00 µm/(m·K)
Rank: 2 (Overall)
97.00 µm/(m·K)
Rank: 1 (Overall)
Tungsten
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9.6 Enthalpy
9.6.1 Enthalpy of Vaporization
Tungsten
69.20 kJ/mol
Rank: 56 (Overall)
65.90 kJ/mol
Rank: 57 (Overall)
Zinc
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9.6.2 Enthalpy of Fusion
Tungsten
2.19 kJ/mol
Rank: 62 (Overall)
2.10 kJ/mol
Rank: 63 (Overall)
Cesium
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9.6.3 Enthalpy of Atomization
Tungsten
82.00 kJ/mol
Rank: 59 (Overall)
78.20 kJ/mol
Rank: 60 (Overall)
Mercury
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9.7 Standard Molar Entropy
Protactinium
76.80 J/mol.K
Rank: 5 (Overall)
85.20 J/mol.K
Rank: 3 (Overall)
Beryllium
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