Cesium
55
Cs
Gruppe
1
Periode
6
Blokk
s
Protoner
Elektroner
Nøytroner
55
55
78
Generelle egenskaper
Atomnummer
55
Atomvekt
132,9054519
Massetall
133
Kategori
Alkalimetaller
Farge
Sølv
Radioaktiv
Ja
From the Latin word caesius, sky blue
Krystallstruktur
Body Centered Cubic
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.
Elektroner per energinivå
2, 8, 18, 18, 8, 1
Elektronkonfigurasjon
[Xe] 6s1
Cesium was the first element discovered using a spectroscope
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
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
Fordampningsvarme
65 kJ/mol
Spesifikk varmekapasitet
0,242 J/g·K
Forekomst i jordskorpa
0,00019%
Forekomst i universet
8×10-8%
CAS Number
7440-46-2
PubChem CID Number
5354618
Atomegenskaper
Atomradius
265 pm
Kovalent radius
244 pm
Elektronegativitet
0,79 (Pauling-skalaen)
Ioniseringsenergi
3,8939 eV
Molart volum
71,07 cm3/mol
Termisk ledningsevne
0,359 W/cm·K
Oksidasjonstilstander
-1, 1
Bruksområder
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
Isotoper
Stabile isotoper
133CsUstabile isotoper
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