Zäsium (Cs)

Allgemeine Eigenschaften

Symbol Cs
Ordnungszahl 55
Atomgewicht 132.9054519
Gruppe
1 (Alkalimetalle oder Wasserstoff-/Lithium-Familie)
IA (IUPAC), IA (CAS)
Solid, Conductor, Alkali Metal, Metal, Stable, Natural
Periode 6
Block s

Physikalische Eigenschaften

Dichte 1.87 g/cm3
Atomvolumen 70.0 cm3/mole
Atomradius 2.67 angstroms
Kovalenzradius 225 pm
Crust Abundance 0.00019%
Crystal Structure Cubic: Body centered
Color Silver

Energien

Elektronengravität 0.8 (Pauling-Skala)
Elektronenaffinität 45.5 kJ/mol
1. Ionisierungsenergie 382 kJ/mol
2. Ionization Energy 2234.3 kJ/mol
3. Ionization Energy 3400 kJ/mol
Spezifische Wärmekapazität 0.24 J g−1 K−1
Wärmeleitfähigkeit 35.9 W·m−1·K−1

Elektronen & Oxidation

Oxidationsstufen 1
Elektronen pro Schale 2 8 18 18 8 1
Elektronenkonfiguration [Xe] 6s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1
Orbital Diagramm
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4f
 
 
 
 
 
 
 
5s
↿⇂
5p
↿⇂
↿⇂
↿⇂
5d
 
 
 
 
 
5f
 
 
 
 
 
 
 
6s
↿ 
6p
 
 
 
6d
 
 
 
 
 
6f
 
 
 
 
 
 
 

Nuclear

Radioaktiv Nein

Medien

Planetarisches Bohrsches Atommodell von Zäsium (Cs)
Lewis Dot Diagramm von Zäsium (Cs)
Description
Very soft, light gray, ductile metal.
Uses
Used as a 'getter' to remove air traces in vacuum and cathode-ray tubes. Also used in producing photoelectric devices and atomic clocks. Since it ionizes readily, it is used as an ion rocket motor propellant.
Sources
Found in pollucite [(Cs4Al4Si9O26).H2O] and as trace in lepidolite.
Pronounciation (English)
SEE-zi-em

Übersetzungen

Afrikaans Sesium
Aragonese Zesio
العربية سيزيوم
Armãneashte Tseziumu
asturianu Cesiu
azərbaycan dili Sezium
български Цезий
বাংলা সিজিয়াম
brezhoneg Seziom
bosanski Cezij[um]
Byelorussian Цэзій
Cebuano Cesyo
čeština Cesium
Chuvash Цези
Cymraeg Cesi
dansk Cæsium, Cesium
Deutsch Zäsium
Ελληνικά Καισιο
English Cesium
esperanto Cezio
español Cesio
eesti Tseesium
euskara Zesioa
فارسی سزیم
suomi Cesium
føroyskt Cæsium
français Césium
furlan Cesi
West-Frysk Cesium
Gaeilge Caeisiam
Gàidhlig Caesiam
galego Cesio
ગુજરાતી સિઝિયમનો
Gaelg Kaishum
Hakka Chinese Set (銫)
עברית צזיום
हिन्दी सीज़ियम
hrvatski Cezij
magyar Cézium
հայերեն Ցեզիում
Indonesia Sesium
íslenska Sesín
italiano Cesio
日本語 セシウム
ქართული ცეზიუმი
کٲشُر Céz
қазақ тілі Цезий
한국어 세슘
Kurdish Sezyûm
Komi Цезий
kernewek Cesyum
кыргызча Цезий
Latin Caesium
Lëtzebuergesch Zäsium
Lombard Cési
lingála Kaesu
lietuvių Cezis
latviešu Cēzijs
Mari Цезий
Maori Cesium
македонски Цезиум
മലയാളം സീസിയം
монгол Цези
Мокшан Цези
Bahasa Melayu Sesium
Malti Siżjum, ²Ċesju
Nahuatl Cesio
Nederlands Cesium
norsk Cesium
Occitan Cesi
ирон Цезий
polski Cez
português Césio
Runasimi Sesyu
română Cesiu
русский Цезий
slovenčina Cézium
slovenščina Cezij
Samoan Fayastonoskotriki
Samogitian Cezis
shqip Cezium
српски Цезијум
Southern Sotho Sesiamo
svenska Cesium
Kiswahili Sizi
தமிழ் சீசியம்
Tajik Сезий
ไทย ซีเซียม
Türkçe Sezyum
ئۇيغۇرچە سېزىي
українська Цезій
o‘zbek Seziy
Tiếng Việt Xezi, Xêzi
Võro Tseesium
中文

Geschichte

Entdeckt
1860
Entdeckt durch
Gustav Kirchhoff, Robert Bunsen
Entdeckt in
Germany
Wortherkunft
From the Latin word "caesius" meaning "sky blue" or "heavenly blue"