Cezij
55
Cs
Skupina
1
Perioda
6
Blok
s
Protoni
Elektroni
Neutroni
55
55
78
Opća svojstva
Atomski broj
55
Relativna atomska masa
132,9054519
Maseni broj
133
Kategorija
Alkalijski metali
Boja
Srebrna
Radioaktivan
Da
Od latinske riječi caesius, nebesko plav
Kristalna struktura
Kubna prostorno centrirana
Povijest
Robert Bunsen and Gustav Kirchhoff were the first to suggest finding cesium in 1860 by spectrum analysis.
They discovered cesium by its two blue emission lines in a sample of Dürkheim mineral water.
The pure metal was eventually isolated by the German chemist Carl Setterberg while working on his doctorate with Kekulé and Bunsen.
They discovered cesium by its two blue emission lines in a sample of Dürkheim mineral water.
The pure metal was eventually isolated by the German chemist Carl Setterberg while working on his doctorate with Kekulé and Bunsen.
Elektrona po ljusci
2, 8, 18, 18, 8, 1
Elektronska konfiguracija
[Xe] 6s1
Cezij je prvi element otkriven pomoću spektroskopa
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
1,873 g/cm3
Talište
301,59 K | 28,44 °C | 83,19 °F
Vrelište
944,15 K | 671 °C | 1239,8 °F
Toplina taljenja
2,09 kJ/mol
Toplina isparavanja
65 kJ/mol
Specifični toplinski kapacitet
0,242 J/g·K
Zastupljenost u Zemljinoj kori
0,00019%
Zastupljenost u svemiru
8×10-8%
CAS broj
7440-46-2
PubChem CID broj
5354618
Atomska svojstva
Atomski radijus
265 pm
Kovalentni radijus
244 pm
Elektronegativnost
0,79 (Paulingova ljestvica)
Potencijal ionizacije
3,8939 eV
Atomski volumen
71,07 cm3/mol
Toplinska vodljivost
0,359 W/cm·K
Stanja oksidacije
-1, 1
Primjene
The radioactive isotope cesium-137 has a half-life of about 30 years and is used in medical applications, industrial gauges, and hydrology.
Cesium is also used in photoelectric cells and as a catalyst in the hydrogenation of organic compounds.
Cesium vapor thermionic generators are low-power devices that convert heat energy to electrical energy.
Cesium is also used in photoelectric cells and as a catalyst in the hydrogenation of organic compounds.
Cesium vapor thermionic generators are low-power devices that convert heat energy to electrical energy.
Cesium compounds are considered to be mildly toxic
Izotopi
Stabilni izotopi
133CsNestabilni izotopi
112Cs, 113Cs, 114Cs, 115Cs, 116Cs, 117Cs, 118Cs, 119Cs, 120Cs, 121Cs, 122Cs, 123Cs, 124Cs, 125Cs, 126Cs, 127Cs, 128Cs, 129Cs, 130Cs, 131Cs, 132Cs, 134Cs, 135Cs, 136Cs, 137Cs, 138Cs, 139Cs, 140Cs, 141Cs, 142Cs, 143Cs, 144Cs, 145Cs, 146Cs, 147Cs, 148Cs, 149Cs, 150Cs, 151Cs