Cesium
55
Cs
Gruppe
1
Periode
6
Blokk
s
Proton
Elektron
Nøytron
55
55
78
Generelle eigenskapar
Atomnummer
55
Atommasse
132,9054519
Massetal
133
Kategori
Alkalimetall
Farge
Sølv
Radioaktiv
Ja
From the Latin word caesius, sky blue
Krystallstruktur
Romsentrert kubisk
Historie
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.
Elektron per energinivå
2, 8, 18, 18, 8, 1
Elektronkonfigurasjon
[Xe] 6s1
Cesium was the first element discovered using a spectroscope
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
1,873 g/cm3
Smeltepunkt
301,59 K | 28,44 °C | 83,19 °F
Kokepunkt
944,15 K | 671 °C | 1239,8 °F
Smeltevarme
2,09 kJ/mol
Fordampingsvarme
65 kJ/mol
Spesifikk varmekapasitet
0,242 J/g·K
Førekomst i jordskorpa
0,00019%
Førekomst i universet
8×10-8%
CAS-nummer
7440-46-2
PubChem CID-nummer
5354618
Atom eigenskapar
Atomradius
265 pm
Kovalent radius
244 pm
Elektronegativitet
0,79 (Paulings skala)
Ioniseringspotensial
3,8939 eV
Molart volum
71,07 cm3/mol
Termisk konduktivitet
0,359 W/cm·K
Oksidasjonstrinn
-1, 1
Bruksområde
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
Isotopar
Stabile isotopar
133CsUstabile isotopar
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