Gadolinium

64
Gd
Golongan
n/a
Periode
6
Blok
f
Proton
Elektron
Neutron
64
64
93
Sifat Umum
Nomor atom
64
Massa atom
157,25
Nomor massa
157
Kategori
Lantanida
Warna
Perak
Radioaktif
Tidak
From gadolinite, a mineral named for Gadolin, a Finnish chemist
Struktur kristal
Segienam Sederhana
Sejarah
Gadolinium was first detected spectroscopically in 1880 by the Swiss chemist Jean Charles Galissard de Marignac who separated its oxide.

He observed spectroscopic lines due to gadolinium in samples of gadolinite and in the separate mineral cerite.

The metal was isolated by Paul Emile Lecoq de Boisbaudran in 1886.
Elektron per kulit
2, 8, 18, 25, 9, 2
Konfigurasi elektron
[Xe] 4f7 5d1 6s2
Gd
Gadolinium has the highest neutron cross-section among any stable nuclides
Sifat Fisika
Fase
Solid
Kepadatan
7,895 g/cm3
Titik lebur
1585,15 K | 1312 °C | 2393,6 °F
Titik didih
3546,15 K | 3273 °C | 5923,4 °F
Kalor peleburan
10 kJ/mol
Kalor penguapan
305 kJ/mol
Kapasitas kalor molar
0,236 J/g·K
Kelimpahan di kerak bumi
0,00052%
Kelimpahan di alam semesta
2×10-7%
Ultrapure
Kredit Gambar: Images-of-elements
Ultrapure amorphous gadolinium
Nomor CAS
7440-54-2
PubChem CID Number
23982
Sifat Atom
Jari-jari atom
180 pm
Jari-jari kovalen
196 pm
Elektronegativitas
1,2 (Skala Pauling)
Potensi Ionisasi
6,1501 eV
Volume atom
19,9 cm3/mol
Kondusivitas termal
0,106 W/cm·K
Bilangan oksidasi
1, 2, 3
Aplikasi
Gadolinium is used to make gadolinium yttrium garnets which have microwave applications.

It is also used in intravenous radiocontrast agents in magnetic resonance imaging (MRI).

Gadolinium compounds are used for making green phosphors for color TV tubes, and in manufacturing compact discs.
Gadolinium is considered to be moderately toxic
Isotop
Isotop stabil
154Gd, 155Gd, 156Gd, 157Gd, 158Gd, 160Gd
Isotop tidak stabil
134Gd, 135Gd, 136Gd, 137Gd, 138Gd, 139Gd, 140Gd, 141Gd, 142Gd, 143Gd, 144Gd, 145Gd, 146Gd, 147Gd, 148Gd, 149Gd, 150Gd, 151Gd, 152Gd, 153Gd, 159Gd, 161Gd, 162Gd, 163Gd, 164Gd, 165Gd, 166Gd, 167Gd, 168Gd, 169Gd