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Sisyo

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(Idinirekta mula sa Caesium)
Caesium, 55Cs
Some pale gold metal, with a liquid-like texture and lustre, sealed in a glass ampoule
Caesium
Pronunciation /ˈsziəm/ (SEE-zee-əm)
Alternative namecesium (US)
Appearancepale gold
Standard atomic weight Ar°(Cs)
  • 132.90545196±0.00000006
  • 132.91±0.01 (pinaikli)[1][2]
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
xenoncaesiumbarium
Atomic number (Z)55
Group1
Period6
Block  s-block
Electron configuration[Xe] 6s1
Electrons per shell2, 8, 18, 18, 8, 1
Physical properties
Phase at STPsolido
Melting point301.7 K ​(28.5 °C, ​83.3 °F)
Boiling point944 K ​(671 °C, ​1240 °F)
Density (at 20° C)1.886 g/cm3[3]
when liquid (at m.p.)1.843 g/cm3
Critical point1938 K, 9.4 MPa[4]
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 states−1, +1[5] (isang matapang na panimulang oksido)
ElectronegativityPauling scale: 0.79
Ionization energies
  • 1st: 375.7 kJ/mol
  • 2nd: 2234.3 kJ/mol
  • 3rd: 3400 kJ/mol
Atomic radiusempirical: 265 pm
Covalent radius244±11 pm
Van der Waals radius343 pm
Color lines in a spectral range
Mga linyang espektral ng caesium
Other properties
Crystal structurebody-centered cubic (bcc) (cI2)
Lattice constant
Bodycentredcubic crystal structure for caesium
a = 616.2 pm (at 20 °C)[3]
Thermal expansion92.6×10−6/K (at 20 °C)[3]
Thermal conductivity35.9 W/(m⋅K)
Electrical resistivity205 nΩ⋅m (at 20 °C)
Magnetic orderingparamagnetic[6]
Young's modulus1.7 GPa
Bulk modulus1.6 GPa
Mohs hardness0.2
Brinell hardness0.14 MPa
CAS Number7440-46-2
History
Namingmula Latin caesius, na ang kahulugan ay "bluish grey", for its spectral colours
DiscoveryRobert Bunsen and Gustav Kirchhoff (1860)
First isolationCarl Setterberg (1882)
Isotopes of caesium
Main isotopes[7] Decay
abun­dance half-life (t1/2) mode pro­duct
131Cs synth 9.7 d ε 131Xe
133Cs 100% stable
134Cs synth 2.0648 y ε 134Xe
β 134Ba
135Cs trace 1.33×106 y β 135Ba
137Cs synth 30.17 y[8] β 137Ba
Kategorya Kategorya: Caesium
| references

Ang sesyo o sesyum[9] (Ingles: cesium, Kastila: cesio) ay isang elementong kimikal na may atomikong bilang na 55 sa talaang peryodiko ng mga elemento. Ito ay may simbolong Cs. Bilang isang may pagka-alkalinang metal, mababa ang punto ng pagkatunaw nito (28 °C). Napakareaktibo nito o agad na tumutugon sa tubig. Mas marahas ang pagtugon nito sa tubig kaysa iba pang mga alkalinang metal. Bilang resulta, iniimbak ang sesyo sa langis na mineral.[10] Isang bihirang elemento ang sesyo, at dahil kakaunti ang sesyo sa mundo, mahal ang halaga nito. Hindi kailangan ng katawan ng tao ang sesyo. Sa maramihang dami, bahagyang nakalalason ito dahil kagaya ito ng potasyo, na hindi rin kailangan ng katawan ng tao.

Mga sanggunian[baguhin | baguhin ang wikitext]

  1. "Standard Atomic Weights: Caesium" (sa wikang Ingles). CIAAW. 2013.{{cite web}}: CS1 maint: date auto-translated (link)
  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 (sa wikang Ingles). doi:10.1515/pac-2019-0603. ISSN 1365-3075.{{cite journal}}: CS1 maint: date auto-translated (link)
  3. 3.0 3.1 3.2 Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.{{cite book}}: CS1 maint: date auto-translated (link)
  4. Haynes, William M., pat. (2011). CRC Handbook of Chemistry and Physics (ika-92nd (na) edisyon). Boca Raton, FL: CRC Press. p. 4.121. ISBN 1-4398-5511-0.{{cite book}}: CS1 maint: date auto-translated (link)
  5. Dye, J. L. (1979). "Compounds of Alkali Metal Anions". Angewandte Chemie International Edition (sa wikang Ingles). 18 (8): 587–598. doi:10.1002/anie.197905871.{{cite journal}}: CS1 maint: date auto-translated (link)
  6. "Magnetic susceptibility of the elements and inorganic compounds". Handbook of Chemistry and Physics (PDF) (ika-87th (na) edisyon). CRC press. ISBN 0-8493-0487-3. Nakuha noong 2010-09-26.{{cite book}}: CS1 maint: date auto-translated (link)
  7. 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.{{cite journal}}: CS1 maint: date auto-translated (link)
  8. "NIST Radionuclide Half-Life Measurements". NIST. Nakuha noong 2011-03-13.{{cite web}}: CS1 maint: date auto-translated (link)
  9. Gaboy, Luciano L. Cesium, sesyo, sesyum - Gabby's Dictionary: Praktikal na Talahuluganang Ingles-Filipino ni Gabby/Gabby's Practical English-Filipino Dictionary, GabbyDictionary.com.
  10. William C. Butterman, William E. Brooks, at Robert G. Reese Jr. 2009. Butterman, William C.; Brooks, William E.; Reese, Jr., Robert G. (2004). "Mineral Commodity Profile: Cesium" (PDF). United States Geological Survey. Nakuha noong 2009-12-27.{{cite web}}: CS1 maint: date auto-translated (link)