Cesium
55
Cs
Ryhmä
1
Jakso
6
Lohko
s
Protonia
Elektronit
Neutronia
55
55
78
Yleiset ominaisuudet
Järjestysluku
55
Atomipaino
132,9054519
Massaluku
133
Luokka
Alkalimetallit
Väri
Hopea
Radioaktiivisuus
Kyllä
From the Latin word caesius, sky blue
Kiderakenne
Tilakeskinen kuutiollinen
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.
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.
Elektroneja elektronikuorilla
2, 8, 18, 18, 8, 1
Orbitaalirakenne
[Xe] 6s1
Cesium was the first element discovered using a spectroscope
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
1,873 g/cm3
Sulamispiste
301,59 K | 28,44 °C | 83,19 °F
Kiehumispiste
944,15 K | 671 °C | 1239,8 °F
Sulamislämpö
2,09 kJ/mol
Höyrystymislämpö
65 kJ/mol
Ominaislämpökapasiteetti
0,242 J/g·K
Esiintyvyys maankuoressa
0,00019%
Esiintyvyys maailmankaikkeudessa
8×10-8%
CAS-numero
7440-46-2
PubChem CID-numero
5354618
Atomiominaisuudet
Atomisäde
265 pm
Kovalenttisäde
244 pm
Elektronegatiivisuus
0,79 (Paulingin asteikko)
Ionisoitumispotentiaali
3,8939 eV
Moolitilavuus
71,07 cm3/mol
Lämmönjohtavuus
0,359 W/cm·K
Hapetusluvut
-1, 1
Käyttö
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
Isotooppi
Vakaat isotoopit
133CsEpävakaat isotoopit
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