Sesium

55
Cs
Golongan
1
Periode
6
Blok
s
Proton
Elektron
Neutron
55
55
78
Sifat Umum
Nomor atom
55
Massa atom
132,9054519
Nomor massa
133
Kategori
Logam alkali
Warna
Perak
Radioaktif
Ya
From the Latin word caesius, sky blue
Struktur kristal
Kubik Berpusat-badan
Sejarah
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.
Elektron per kulit
2, 8, 18, 18, 8, 1
Konfigurasi elektron
[Xe] 6s1
Cs
Cesium was the first element discovered using a spectroscope
Sifat Fisika
Fase
Solid
Kepadatan
1,873 g/cm3
Titik lebur
301,59 K | 28,44 °C | 83,19 °F
Titik didih
944,15 K | 671 °C | 1239,8 °F
Kalor peleburan
2,09 kJ/mol
Kalor penguapan
65 kJ/mol
Kapasitas kalor molar
0,242 J/g·K
Kelimpahan di kerak bumi
0,00019%
Kelimpahan di alam semesta
8×10-8%
Cesium
Kredit Gambar: Wikimedia Commons (Dnn87)
Cesium metal sample from the Dennis s.k collection
Nomor CAS
7440-46-2
PubChem CID Number
5354618
Sifat Atom
Jari-jari atom
265 pm
Jari-jari kovalen
244 pm
Elektronegativitas
0,79 (Skala Pauling)
Potensi Ionisasi
3,8939 eV
Volume atom
71,07 cm3/mol
Kondusivitas termal
0,359 W/cm·K
Bilangan oksidasi
-1, 1
Aplikasi
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
Isotop
Isotop stabil
133Cs
Isotop tidak stabil
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