Cesium

55
Cs
Grupp
1
Period
6
Block
s
Protoner
Electrons
Neutroner
55
55
78
Generella Egenskaper
Atomnummer
55
Atommassa
132,9054519
Mass Number
133
Kategori
Alkalimetaller
Färg
Silver
Radioaktiv
Ja
From the Latin word caesius, sky blue
Kristallstruktur
Rymdcentrerat kubisk
Historia
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.
Elektroner per skal
2, 8, 18, 18, 8, 1
Elektronkonfiguration
[Xe] 6s1
Cs
Cesium was the first element discovered using a spectroscope
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
1,873 g/cm3
Smältpunkt
301,59 K | 28,44 °C | 83,19 °F
Kokpunkt
944,15 K | 671 °C | 1239,8 °F
Smältvärme
2,09 kJ/mol
Ångbildningsvärme
65 kJ/mol
Specifik värmekapacitet
0,242 J/g·K
Abundance in Earth's crust
0,00019%
Abundance in Universe
8×10-8%
Cesium
Bildkrediter: Wikimedia Commons (Dnn87)
Cesium metal sample from the Dennis s.k collection
CAS Number
7440-46-2
PubChem CID Number
5354618
Atomära Egenskaper
Atomradie
265 pm
Kovalent radie
244 pm
Elektronegativitet
0,79 (Paulingskalan)
Jonisationspotential
3,8939 eV
Molvolym
71,07 cm3/mol
Värmeledningsförmåga
0,359 W/cm·K
Oxidationstillstånd
-1, 1
Applications
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 compounds are considered to be mildly toxic
Isotoper
Stabila isotoper
133Cs
Instabila 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