Samarium

62
Sm
Golongan
n/a
Periode
6
Blok
f
Proton
Elektron
Neutron
62
62
88
Sifat Umum
Nomor atom
62
Massa atom
150,36
Nomor massa
150
Kategori
Lantanida
Warna
Perak
Radioaktif
Tidak
From samarskite, a mineral named after Russian mine official, Col. Samarski
Struktur kristal
Trigonal Sederhana
Sejarah
In 1853, Jean Charles Galissard de Marignac discovered samarium when he found lines in mineral spectra.

Paul Émile Lecoq de Boisbaudran isolated a samarium salt in Paris in 1879 from the mineral samarskite and identified a new element in it via sharp optical absorption lines.

The pure element was produced only in 1901 by Eugène-Anatole Demarçay.
Elektron per kulit
2, 8, 18, 24, 8, 2
Konfigurasi elektron
[Xe] 4f6 6s2
Sm
Samarium metal can be produced by reducing the oxide with lanthanum
Sifat Fisika
Fase
Solid
Kepadatan
7,52 g/cm3
Titik lebur
1345,15 K | 1072 °C | 1961,6 °F
Titik didih
2067,15 K | 1794 °C | 3261,2 °F
Kalor peleburan
8,6 kJ/mol
Kalor penguapan
175 kJ/mol
Kapasitas kalor molar
0,197 J/g·K
Kelimpahan di kerak bumi
0,0006%
Kelimpahan di alam semesta
5×10-7%
Ultrapure
Kredit Gambar: Images-of-elements
Ultrapure sublimated samarium
Nomor CAS
7440-19-9
PubChem CID Number
23951
Sifat Atom
Jari-jari atom
180 pm
Jari-jari kovalen
198 pm
Elektronegativitas
1,17 (Skala Pauling)
Potensi Ionisasi
5,6437 eV
Volume atom
20,0 cm3/mol
Kondusivitas termal
0,133 W/cm·K
Bilangan oksidasi
2, 3
Aplikasi
Samarium's main use is in samarium-cobalt alloy magnets for headphones, small motors and pickups for some electric guitars.

Radioactive samarium-153 is used to kill cancer cells in the treatment of lung cancer, prostate cancer, breast cancer and osteosarcoma.

Samarium and its compounds are also used as catalyst and chemical reagent.
Samarium is considered to be moderately toxic
Isotop
Isotop stabil
144Sm, 149Sm, 150Sm, 152Sm, 154Sm
Isotop tidak stabil
128Sm, 129Sm, 130Sm, 131Sm, 132Sm, 133Sm, 134Sm, 135Sm, 136Sm, 137Sm, 138Sm, 139Sm, 140Sm, 141Sm, 142Sm, 143Sm, 145Sm, 146Sm, 147Sm, 148Sm, 151Sm, 153Sm, 155Sm, 156Sm, 157Sm, 158Sm, 159Sm, 160Sm, 161Sm, 162Sm, 163Sm, 164Sm, 165Sm