Serium

58
Ce
Golongan
n/a
Periode
6
Blok
f
Proton
Elektron
Neutron
58
58
82
Sifat Umum
Nomor atom
58
Massa atom
140,116
Nomor massa
140
Kategori
Lantanida
Warna
Perak
Radioaktif
Tidak
Cerium was named for the asteroid Ceres
Struktur kristal
Segienam Sederhana
Sejarah
Jöns Jakob Berzelius and Wilhelm Hisinger discovered the element in ceria in 1803 in Sweden.

Klaproth discovered it simultaneously and independently in some tantalum samples in Germany.

Carl Gustaf Mosander, who worked closely with Berzelius, prepared metallic cerium in 1825.
Elektron per kulit
2, 8, 18, 19, 9, 2
Konfigurasi elektron
[Xe] 4f1 5d1 6s2
Ce
Seawater contains 1.5 parts per trillion of cerium
Sifat Fisika
Fase
Solid
Kepadatan
6,77 g/cm3
Titik lebur
1068,15 K | 795 °C | 1463 °F
Titik didih
3716,15 K | 3443 °C | 6229,4 °F
Kalor peleburan
5,5 kJ/mol
Kalor penguapan
350 kJ/mol
Kapasitas kalor molar
0,192 J/g·K
Kelimpahan di kerak bumi
0,006%
Kelimpahan di alam semesta
1×10-6%
Ultrapure
Kredit Gambar: Images-of-elements
Ultrapure cerium under argon
Nomor CAS
7440-45-1
PubChem CID Number
23974
Sifat Atom
Jari-jari atom
182 pm
Jari-jari kovalen
204 pm
Elektronegativitas
1,12 (Skala Pauling)
Potensi Ionisasi
5,5387 eV
Volume atom
20,67 cm3/mol
Kondusivitas termal
0,114 W/cm·K
Bilangan oksidasi
2, 3, 4
Aplikasi
Cerium is used in carbon-arc lighting, especially in the motion picture industry.

Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps.

Cerium compounds are also used in the manufacture of glass, both as a component and as a decolorizer.
Cerium is considered to be moderately toxic
Isotop
Isotop stabil
136Ce, 138Ce, 140Ce, 142Ce
Isotop tidak stabil
119Ce, 120Ce, 121Ce, 122Ce, 123Ce, 124Ce, 125Ce, 126Ce, 127Ce, 128Ce, 129Ce, 130Ce, 131Ce, 132Ce, 133Ce, 134Ce, 135Ce, 137Ce, 139Ce, 141Ce, 143Ce, 144Ce, 145Ce, 146Ce, 147Ce, 148Ce, 149Ce, 150Ce, 151Ce, 152Ce, 153Ce, 154Ce, 155Ce, 156Ce, 157Ce