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Title: Chemistry/Elements/Cesium - EnvironmentalChemistry.com: Cesium Atomic structure, chemical and physical properties, and table of nuclides.
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Periodic Table of Elements: Cesium – Cs (EnvironmentalChemistry.com)
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Periodic Table of ElementsElement Cesium – CsComprehensive data on the chemical element Cesium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Cesium.
Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one studies.
Using the "Periodic Table of Elements Quick Navigation" graphic at the bottom of the sidebar menu, one can quickly jump from chemical element to chemical element.
Cesium Menu
Cesium Page One
Overview of Cesium
Cesium's Name in Other Languages
Atomic Structure of Cesium
Chemical Properties of Cesium
Physical Properties of Cesium
Regulatory / Health
Who/When/Where/How
Cesium Page Two
Nuclides / Isotopes
Potential Parent Nuclides
Cesium Page Three
Common Chemical Compounds of Cesium
Overview of Cesium
Atomic Number:55
Group: 1
Period: 6
Series: Alkali Metals
Cesium's Name in Other LanguagesLatin: CaesiumCzech: CesiumCroatian: CezijFrench:
CésiumGerman: Zäsium - sItalian: CesioNorwegian: CesiumPortuguese: Césio
Russian:  Spanish: CesioSwedish:
Cesium
Atomic Structure of Cesium
Atomic Radius: 3.34Å
Atomic Volume: 71.07cm3/mol
Covalent Radius: 2.35Å
Cross Section (Thermal Neutron Capture) a/barns: 29
Crystal Structure: Cubic body centered
Electron Configuration:1s2
2s2p6
3s2p6d10
4s2p6d10
5s2p6
6s1
Electrons per Energy Level: 2,8,18,18,8,1
Shell Model
Ionic Radius: 1.67Å
Filling Orbital: 6s1
Number of Electrons (with no charge): 55
Number of Neutrons (most common/stable nuclide): 78
Number of Protons: 55
Oxidation States: 1
Valence Electrons: 6s1
Electron Dot Model
Chemical Properties of Cesium
Electrochemical Equivalent: 4.9587g/amp-hr
Electron Work Function: 2.14eV
Electronegativity: 0.79 (Pauling); 0.86 (Allrod Rochow)
Heat of Fusion: 2.092kJ/mol
Incompatibilities:
Ionization PotentialFirst: 3.894Second: 25.1
Valence Electron Potential (-eV): 8.62
Physical Properties of Cesium
Atomic Mass Average: 132.9054
Boiling Point: 944K 671°C 1240°F
Coefficient of lineal thermal expansion/K-1: 97E-6
ConductivityElectrical: 0.0489 106/cm  Thermal: 0.359 W/cmK
Density: 1.873g/cc @ 300K
Description:Soft light silvery-white alkali metal.
Elastic Modulus:Bulk: 1.6/GPaRigidity: 0.65/GPaYoungs: 1.7/GPa
Enthalpy of Atomization: 78.2 kJ/mole @ 25°C
Enthalpy of Fusion: 2.1 kJ/mole
Enthalpy of Vaporization: 65.9 kJ/mole
Flammablity Class:
Freezing Point: see melting point
Hardness ScaleBrinell: 0.14 MN m-2Mohs: 0.2
Heat of Vaporization: 67.74kJ/mol
Melting Point: 301.7K 28.55°C 83.39°F
Molar Volume: 70.73 cm3/mole
Physical State (at 20°C & 1atm): Solid
Specific Heat: 0.24J/gK
Vapor Pressure 2.5kPa
Regulatory / Health
CAS Number
7440-46-2
RTECS: FK9225000OSHA Permissible Exposure Limit (PEL)No limits set by
OSHA
OSHA PEL Vacated 1989No limits set by OSHA
NIOSH Recommended Exposure Limit (REL)No limits set by NIOSH
Levels In Humans:Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.Blood/mg dm-3: 0.0038Bone/p.p.m: 0.013-0.052Liver/p.p.m: 0.04-0.05Muscle/p.p.m: 0.07-1.6Daily Dietary Intake: 0.004-0.03 mgTotal Mass In
Avg. 70kg human: 6 mg
Who / Where / When / HowDiscoverer: Gustov R. Kirchoff, Robert BunsenDiscovery Location: Heidelberg Germany
Discovery Year: 1860Name Origin: Latin: caesius (sky blue); its salts turn flames blue.
Abundance of Cesium:Earth's Crust/p.p.m.: 3
Seawater/p.p.m.: 0.0003
Atmosphere/p.p.m.: N/A
Sun (Relative to H=1E12): 80
Sources of Cesium:Found in pollucite [(Cs4Al4Si9O26).H2O] and as trace in lepidolite. World production is around 20 tons per year. Primary mining areas are in Bernic Lake (Manitoba, Canada), Bikita (Zimbabwe)
and South-West Africa.
Uses of Cesium:Used as a 'getter' to remove air traces in vacuum tubes. Since it ionizes readily, it is used as an ion rocket motor propellant. Also used in photoelectric cells, atomic clocks, infared lamps.
Additional Notes:Cesium can have very serious effects on the body if taken in excess.
[Last update: 2/22/2007]Notes below
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Cesium Menu
Cesium Page One
Overview of Cesium
Cesium's Name in Other Languages
Atomic Structure of Cesium
Chemical Properties of Cesium
Physical Properties of Cesium
Regulatory / Health
Who/When/Where/How
Cesium Page Two
Nuclides / Isotopes
Potential Parent Nuclides
Cesium Page Three
Common Chemical Compounds of Cesium
Related Resources
Anatomy of the Atom
Answers many questions regarding the structure of atoms.
Molarity, Molality and Normality
Introduces stoichiometry and explains the differences between molarity, molality and normality.
Molar Mass Calculations and Javascript Calculator
Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
Chemical Database
This database focuses on the most common chemical compounds used in the home and industry.
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