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.
Quick Facts Caesium, Panagway ...
| Caesium |
|---|
55Cs |
|
|
| Panagway |
silvery gold
 |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan |
caesium, Cs, 55 |
| Paglitok |
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-zee-əm]] |
| Kategoriyang elemento |
puthaw |
| Group, period, block |
1, 6, s |
| Gibug-aton sa atomo |
132.9054519(2) |
| Kontorno sa elektron |
[Xe] 6s1
2, 8, 18, 18, 8, 1
 Electron shells of caesium (2, 8, 18, 18, 8, 1) |
| History |
| Pagkadiskobre |
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
|
| 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 |
|
| · r |
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