Cesium
55
Cs
Groep
1
Periode
6
Blok
s
Protonen
Elektronen
Neutronen
55
55
78
Algemene Eigenschappen
Atoomnummer
55
Atomair gewicht
132,9054519
Massa Getal
133
Categorie
Alkalimetalen
Kleur
Zilver
Radioactief
Ja
From the Latin word caesius, sky blue
Kristalstructuur
Ruimtelijk-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 18, 18, 8, 1
Electronconfiguratie
[Xe] 6s1
Cesium was the first element discovered using a spectroscope
Fysieke Eigenschappen
Fase
Vast
Dichtheid
1,873 g/cm3
Smeltpunt
301,59 K | 28,44 °C | 83,19 °F
Kookpunt
944,15 K | 671 °C | 1239,8 °F
Fusiewarmte
2,09 kJ/mol
Verdampingswarmte
65 kJ/mol
Specifieke Warmtecapaciteit
0,242 J/g·K
Overvloedig aanwezig in de aardkorst
0,00019%
Overvloedig aanwezig in het universum
8×10-8%
Verdiensten voor afbeeldingen: Wikimedia Commons (Dnn87)
Cesium metal sample from the Dennis s.k collection
CAS-nummer
7440-46-2
PubChem CID nummer
5354618
Atoomeigenschappen
Atoomstraal
265 pm
Covalentiestraal
244 pm
Electronegativiteit
0,79 (Pauling schaal)
Ionisatiepotentiaal
3,8939 eV
Atoomvolume
71,07 cm3/mol
Thermische geleiding
0,359 W/cm·K
Oxidatietoestanden
-1, 1
Toepassingen
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
Isotopen
Stabiele isotopen
133CsInstabiele isotopen
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