Sisyo

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.

Caesium, ₅₅Cs

Caesium
Bigkas	/ˈsiːziəm/ ​(SEE-zee-əm)
Alternative name	cesium (US)
Appearance	pale gold
Standard atomic weight Ar°(Cs)
	132.90545196±0.00000006 132.91±0.01 (pinaikli)[1][2]
Caesium sa talahanayang peryodiko
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
Atomikong bilang (Z)	55
Group	1
Period	6
Block	s-block
Electron configuration	[Xe] 6s1
Electrons per shell	2, 8, 18, 18, 8, 1
Physical properties
Phase at STP	solido
Melting point	301.7 K ​(28.5 °C, ​83.3 °F)
Boiling point	944 K ​(671 °C, ​1240 °F)
Density (at 20° C)	1.886 g/cm3 [3]
when liquid (at m.p.)	1.843 g/cm3
Critical point	1938 K, 9.4 MPa[4]
Heat of fusion	2.09 kJ/mol
Heat of vaporization	63.9 kJ/mol
Molar heat capacity	32.210 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)
Electronegativity	Pauling scale: 0.79
Ionization energies	1st: 375.7 kJ/mol 2nd: 2234.3 kJ/mol 3rd: 3400 kJ/mol
Atomic radius	empirical: 265 pm
Covalent radius	244±11 pm
Van der Waals radius	343 pm
Mga linyang espektral ng caesium
Other properties
Crystal structure	​body-centered cubic (bcc) (cI2)
Lattice constant	a = 616.2 pm (at 20 °C)[3]
Thermal expansion	92.6×10−6/K (at 20 °C)[3]
Thermal conductivity	35.9 W/(m⋅K)
Electrical resistivity	205 nΩ⋅m (at 20 °C)
Magnetic ordering	paramagnetic[6]
Young's modulus	1.7 GPa
Bulk modulus	1.6 GPa
Mohs hardness	0.2
Brinell hardness	0.14 MPa
CAS Number	7440-46-2
History
Naming	mula Latin caesius, na ang kahulugan ay "bluish grey", for its spectral colours
Discovery	Robert Bunsen and Gustav Kirchhoff (1860)
First isolation	Carl Setterberg (1882)
Isotopes of caesium t b
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: Caesium tingnan usapan baguhin | references

Mga sanggunian

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. 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)