Cesyo

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Caesium
55Cs
Rb

Cs

Fr
xenoncaesiumbarium
Appearance
silvery gold
Some silvery-gold metal, with a liquid-like texture and lustre, sealed in a glass ampoule
General properties
Name, simbolo, kaiphan caesium, Cs, 55
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category puthaw
Group, period, block 16, s
Standard atomic weight 132.9054519(2)
Electron configuration [Xe] 6s1
2, 8, 18, 18, 8, 1
Electron shells of caesium (2, 8, 18, 18, 8, 1)
History
Discovery Robert Bunsen and Gustav Kirchhoff (1860)
First isolation Carl Setterberg (1882)
Physical properties
Phase magahi
Density (near r.t.) 1.93 g·cm−3
Liquid density at m.p. 1.843 g·cm−3
Melting point 301.59 K, 28.44 °C, 83.19 °F
Boiling point 944 K, 671 °C, 1240 °F
Critical point 1938 K, 9.4 MPa
Heat of fusion 2.09 kJ·mol−1
Heat of vaporization 63.9 kJ·mol−1
Molar heat capacity 32.210 J·mol−1·K−1
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
(strongly basic oxide)
Electronegativity 0.79 (Pauling scale)
Ionization energies 1st: 375.7 kJ·mol−1
2nd: 2234.3 kJ·mol−1
3rd: 3400 kJ·mol−1
Atomic radius 265 pm
Covalent radius 244±11 pm
Van der Waals radius 343 pm
Miscellanea
Crystal structure body-centered cubic
Caesium has a body-centered cubic crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (20 °C) 205 nΩ·m
Thermal conductivity 35.9 W·m−1·K−1
Thermal expansion (25 °C) 97 µm·m−1·K−1
Young's modulus 1.7 GPa
Bulk modulus 1.6 GPa
Mohs hardness 0.2
Brinell hardness 0.14 MPa
CAS registry number 7440-46-2
Most stable isotopes
Main article: Isotopes of caesium
iso NA half-life DM DE (MeV) DP
133Cs 100% 133Cs is stable with 78 neutrons
134Cs syn 2.0648 y ε 1.229 134Xe
β 2.059 134Ba
135Cs trace 2.3×106 y β 0.269 135Ba
137Cs trace 30.17 y[2] β 1.174 137Ba
t  h  u
· r

Ang cesyo (Iningles caesium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Cs ug kaiphan nga atomik 55. Ang cesyo mao ang puthaw.

Ang mga gi basihan niini[usba | edit source]

  1. "Magnetic susceptibility of the elements and inorganic compounds" (PDF). Handbook of Chemistry and Physics (81st ed.), CRC press, http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf. Gikuha sa 26 Septiyembre 2010. 
  2. "NIST Radionuclide Half-Life Measurements". Retrieved on 2011-03-13.


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