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Revision as of 14:10, 18 September 2013 view sourceDouble sharp (talk | contribs)Autopatrolled, Extended confirmed users, Page movers, File movers, Pending changes reviewers102,107 edits And the dying star watched as it collapsed into a black hole, seeing the nuclei of heavy elements rushing out into deep space. It knew they would decay. Nevertheless it took delight in that moment, as much as it could, before collapsing into oblivion.← Previous edit Revision as of 14:12, 18 September 2013 view source Double sharp (talk | contribs)Autopatrolled, Extended confirmed users, Page movers, File movers, Pending changes reviewers102,107 edits and naturally, I waste enough time writing weird stuff in the edit summary that I forgot to do thisNext edit →
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|Brinell hardness=0.14 |Brinell hardness=0.14
|CAS number=7440-46-2 |CAS number=7440-46-2
|isotopes={{Elementbox_isotopes_stable | mn=133 | sym=Cs | na=100% | hl=- | dm=(]) | de=<34.753 | pn= | ps= }} |isotopes={{Elementbox_isotopes_decay | mn=133 | sym=Cs | na=100% | hl=- | dm=(]) | de=<34.753 | pn= | ps= }}
{{Elementbox_isotopes_decay2 | mn=134 | sym=Cs {{Elementbox_isotopes_decay2 | mn=134 | sym=Cs
| na=] | hl=2.0648 ] | na=] | hl=2.0648 ]

Revision as of 14:12, 18 September 2013

Chemical element with atomic number (Cs)
Caesium, 00Cs
Some pale gold metal, with a liquid-like texture and lustre, sealed in a glass ampoule
Caesium
Pronunciation/ˈsiːziəm/ ​(SEE-zee-əm)
Appearancesilvery gold
Standard atomic weight Ar°(Cs)
  • 132.90545196±0.00000006
  • 132.91±0.01 (abridged)
Caesium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Rb
↑
Cs
↓
Fr
xenon ← caesium → barium
Groupgroup 1: hydrogen and alkali metals
Periodperiod 6
Block  s-block
Electron configuration[Xe] 6s
Electrons per shell2, 8, 18, 18, 8, 1
Physical properties
Phase at STPsolid
Melting point301.7 K ​(28.5 °C, ​83.3 °F)
Boiling point944 K ​(671 °C, ​1240 °F)
Density (near r.t.)1.93 g/cm
when liquid (at m.p.)1.843 g/cm
Critical point1938 K, 9.4 MPa
Heat of fusion2.09 kJ/mol
Heat of vaporization63.9 kJ/mol
Molar heat capacity32.210 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 418 469 534 623 750 940
Atomic properties
Oxidation statescommon: +1
−1
ElectronegativityPauling scale: 0.79
Atomic radiusempirical: 265 pm
Covalent radius244±11 pm
Van der Waals radius343 pm
Color lines in a spectral range
Spectral lines of caesium
Other properties
Natural occurrenceprimordial
Crystal structure ​body-centered cubic (bcc)Body-centered cubic crystal structure for caesium
Thermal expansion97 µm/(m⋅K) (at 25 °C)
Thermal conductivity35.9 W/(m⋅K)
Electrical resistivity205 n Ω⋅m (at 20 °C)
Magnetic orderingparamagnetic
Young's modulus1.7 GPa
Bulk modulus1.6 GPa
Mohs hardness0.2
Brinell hardness0.14 MPa
CAS Number7440-46-2
History
DiscoveryRobert Bunsen and Gustav Kirchhoff (1860)
First isolationCarl Setterberg (1882)
Isotopes of caesium
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
Cs synth 9.7 d ε Xe
Cs 100% stable
Cs synth 2.0648 y ε Xe
β Ba
Cs trace 1.33×10 y β Ba
Cs synth 30.17 y β Ba
 Category: Caesium
| references

References

These references will appear in the article, but this list appears only on this page.
  1. "Standard Atomic Weights: Caesium". CIAAW. 2013.
  2. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  3. Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. p. 4.121. ISBN 1-4398-5511-0.
  4. Dye, J. L. (1979). "Compounds of Alkali Metal Anions". Angewandte Chemie International Edition. 18 (8): 587–598. doi:10.1002/anie.197905871.
  5. "Magnetic susceptibility of the elements and inorganic compounds". Handbook of Chemistry and Physics (PDF) (87th ed.). CRC press. ISBN 0-8493-0487-3. Retrieved 2010-09-26.
  6. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  7. ^ "NIST Radionuclide Half-Life Measurements". NIST. Retrieved 2011-03-13. Cite error: The named reference "isotope" was defined multiple times with different content (see the help page).


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