Symbol
Cs
Group Number
1
Rank: 17 (Overall)
0
17
👆🏻
Period Number
6
Rank: 2 (Overall)
2
7
👆🏻
Block
s block
Element Family
Alkali
CAS Number
7440462
Rank: 40 (Overall)
7429905
54386242
👆🏻
Space Group Name
Im_ 3m
Space Group Number
229.00
Rank: 2 (Overall)
11
276
👆🏻
Interesting Facts
Cesium is the most alkaline metal and is used in atomic clocks.
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Robert Bunsen and Gustav Kirchhoff
Discovery
In 1860
Abundance
Abundance In Universe
0.00 %
Rank: 25 (Overall)
0
0.11
👆🏻
Abundance In Sun
0.00 %
Rank: 20 (Overall)
0
0.1
👆🏻
Abundance In Meteorites
0.00 %
Rank: 38 (Overall)
0
22
👆🏻
Abundance In Earth's Crust
0.00 %
Rank: 35 (Overall)
1E-37
8.1
👆🏻
Abundance In Oceans
0.00 %
Rank: 17 (Overall)
0
1.1
👆🏻
Abundance In Humans
0.00 %
Rank: 20 (Overall)
0
1.4
👆🏻
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.
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
-
Other Uses
Alloys
Biological Properties
Toxicity
Mildly Toxic
Present in Human Body
✔
✘
76% - Alkali Metals Metals have it !
In Blood
0.00 Blood/mg dm-3
Rank: 28 (Overall)
0
1970
👆🏻
In Bone
0.05 p.p.m.
Rank: 31 (Overall)
0
170000
👆🏻
Melting Point
28.50 °C
Rank: 80 (Overall)
-38.83
3410
👆🏻
Boiling Point
678.40 °C
Rank: 77 (Overall)
0
5660
👆🏻
Appearance
Physical State
Solid
Color
Silvery Gold
Luster
-
Hardness
Mohs Hardness
0.20
Rank: 27 (Overall)
0.2
8.5
👆🏻
Brinell Hardness
0.14 MPa
Rank: 71 (Overall)
0.14
3490
👆🏻
Vickers Hardness
0.14 MPa
Rank: 72 (Overall)
0
3920
👆🏻
Speed of Sound
1,630.00 m/s
Rank: 64 (Overall)
818
16200
👆🏻
Optical Properties
Refractive Index
1.93
Rank: 17 (Overall)
0.155
3.41
👆🏻
Reflectivity
35.00 %
Rank: 34 (Overall)
5
97
👆🏻
Allotropes
✔
✘
8% - Alkali Metals Metals
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical Formula
Cs
Isotopes
Known Isotopes
36
Rank: 3 (Overall)
0
38
👆🏻
Electronegativity
Pauling Electronegativity
0.79
Rank: 53 (Overall)
0
2.6
👆🏻
Sanderson Electronegativity
0.22
Rank: 53 (Overall)
0.22
2.56
👆🏻
Allred Rochow Electronegativity
0.86
Rank: 42 (Overall)
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
0.62
Rank: 55 (Overall)
0.62
2.48
👆🏻
Allen Electronegativity
0.66
Rank: 68 (Overall)
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
3.21
Rank: 2 (Overall)
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
375.70 kJ/mol
Rank: 90 (Overall)
375.7
26130
👆🏻
2nd Energy Level
2,234.30 kJ/mol
Rank: 8 (Overall)
392.8
28750
👆🏻
3rd Energy Level
3,400.00 kJ/mol
Rank: 16 (Overall)
392.8
34230
👆🏻
4th Energy Level
375.70 kJ/mol
Rank: 87 (Overall)
375.7
37066
👆🏻
5th Energy Level
3,750.00 kJ/mol
Rank: 84 (Overall)
392
97510
👆🏻
6th Energy Level
3,750.00 kJ/mol
Rank: 89 (Overall)
1007
105800
👆🏻
7th Energy level
3,750.00 kJ/mol
Rank: 82 (Overall)
1007
114300
👆🏻
8th Energy Level
3,760.00 kJ/mol
Rank: 81 (Overall)
730
125300
👆🏻
9th Energy Level
3,750.00 kJ/mol
Rank: 83 (Overall)
1007
134700
👆🏻
10th Energy Level
3,757.00 kJ/mol
Rank: 77 (Overall)
392
144300
👆🏻
11th Energy Level
3,757.00 kJ/mol
Rank: 82 (Overall)
392
169988
👆🏻
12th Energy Level
3,750.00 kJ/mol
Rank: 85 (Overall)
0
189368
👆🏻
13th Energy Level
3,750.00 kJ/mol
Rank: 81 (Overall)
1007
76015
👆🏻
14th Energy Level
3,750.00 kJ/mol
Rank: 59 (Overall)
380
86450
👆🏻
15th Energy Level
37,500.00 kJ/mol
Rank: 83 (Overall)
33000
100700
👆🏻
16th Energy Level
375.70 kJ/mol
Rank: 85 (Overall)
375.7
109480
👆🏻
17th Energy Level
375.70 kJ/mol
Rank: 92 (Overall)
375.7
122200
👆🏻
18th Energy Level
3,757.00 kJ/mol
Rank: 79 (Overall)
0
134810
👆🏻
19th Energy Level
375.70 kJ/mol
Rank: 92 (Overall)
375.7
148700
👆🏻
20th Energy Level
375.00 kJ/mol
Rank: 82 (Overall)
0
171200
👆🏻
21st Energy Level
375.70 kJ/mol
Rank: 91 (Overall)
375.7
179100
👆🏻
22nd Energy Level
375.00 kJ/mol
Rank: 78 (Overall)
330
184900
👆🏻
23rd Energy Level
375.70 kJ/mol
Rank: 87 (Overall)
357.6
198800
👆🏻
24th Energy Level
375.70 kJ/mol
Rank: 88 (Overall)
297.3
195200
👆🏻
25th Energy Level
375.70 kJ/mol
Rank: 80 (Overall)
0
121900
👆🏻
26th Energy Level
375.70 kJ/mol
Rank: 88 (Overall)
357.6
127700
👆🏻
27th Energy Level
375.70 kJ/mol
Rank: 84 (Overall)
0
133800
👆🏻
28th Energy Level
375.70 kJ/mol
Rank: 87 (Overall)
297.3
139800
👆🏻
29th Energy Level
375.70 kJ/mol
Rank: 89 (Overall)
0
148100
👆🏻
30th Energy Level
375.70 kJ/mol
Rank: 82 (Overall)
0
154500
👆🏻
Electrochemical Equivalent
4.96 g/amp-hr
Rank: 3 (Overall)
0.16812
8.3209
👆🏻
Electron Work Function
2.14 eV
Rank: 58 (Overall)
2.14
6
👆🏻
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Number
55
Rank: 61 (Overall)
3
117
👆🏻
Electron Configuration
[Xe] 6s1
Crystal Structure
Body Centered Cubic (BCC)
Crystal Lattice
Atom
Number of Protons
55
Rank: 60 (Overall)
3
117
👆🏻
Number of Neutrons
78
Rank: 44 (Overall)
4
285
👆🏻
Number of Electrons
55
Rank: 60 (Overall)
3
117
👆🏻
Radius of an Atom
Atomic Radius
265.00 pm
Rank: 2 (Overall)
0
348
👆🏻
Covalent Radius
244.00 pm
Rank: 2 (Overall)
0
260
👆🏻
Van der Waals Radius
343.00 pm
Rank: 2 (Overall)
0
348
👆🏻
Atomic Weight
132.91 amu
Rank: 55 (Overall)
6.94
294
👆🏻
Atomic Volume
71.07 cm3/mol
Rank: 1 (Overall)
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
8.62 (-eV)
Rank: 71 (Overall)
0
392.42
👆🏻
Lattice Constant
614.10 pm
Rank: 5 (Overall)
0
891.25
👆🏻
Lattice Angles
π/2, π/2, π/2
Lattice C/A Ratio
1.87
Rank: 3 (Overall)
0.423
1.9
👆🏻
Density
Density At Room Temperature
1.93 g/cm3
Rank: 81 (Overall)
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
1.84 g/cm3
Rank: 83 (Overall)
0.512
41
👆🏻
Tensile Strength
15.00 MPa
Rank: 48 (Overall)
0.1
11000
👆🏻
Viscosity
0.00
Rank: 25 (Overall)
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
Rank: 22 (Overall)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)
Rank: 30 (Overall)
0
774
👆🏻
Elasticity properties
Shear Modulus
30.00 GPa
Rank: 27 (Overall)
1.3
222
👆🏻
Bulk Modulus
1.60 GPa
Rank: 66 (Overall)
0
462
👆🏻
Young's Modulus
1.70 GPa
Rank: 73 (Overall)
0
528
👆🏻
Poisson Ratio
0.35
Rank: 9 (Overall)
0.032
0.47
👆🏻
Other Mechanical Properties
Ductile
Magnetic Characteristics
Specific Gravity
1.87
Rank: 80 (Overall)
0.53
4500
👆🏻
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m
Rank: 17 (Overall)
1.25643E-06
0.0063
👆🏻
Susceptibility
0.00
Rank: 24 (Overall)
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
Semiconductor
Resistivity
205.00 nΩ·m
Rank: 17 (Overall)
0.1
961
👆🏻
Electrical Conductivity
0.05 106/cm Ω
Rank: 40 (Overall)
0
0.63
👆🏻
Electron Affinity
45.50 kJ/mol
Rank: 30 (Overall)
0
222.8
👆🏻
Specific Heat
0.24 J/(kg K)
Rank: 23 (Overall)
0.1
3.6
👆🏻
Molar Heat Capacity
32.21 J/mol·K
Rank: 6 (Overall)
13.1
62.7
👆🏻
Thermal Conductivity
35.90 W/m·K
Rank: 37 (Overall)
0
429
👆🏻
Critical Temperature
1,938.00 K
Rank: 22 (Overall)
26.3
3695
👆🏻
Thermal Expansion
97.00 µm/(m·K)
Rank: 1 (Overall)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
65.90 kJ/mol
Rank: 84 (Overall)
7.32
799.1
👆🏻
Enthalpy of Fusion
2.10 kJ/mol
Rank: 71 (Overall)
2.1
35.23
👆🏻
Enthalpy of Atomization
78.20 kJ/mol
Rank: 72 (Overall)
61.5
837
👆🏻
Standard Molar Entropy
85.20 J/mol.K
Rank: 3 (Overall)
9.5
198.1
👆🏻