Niobium

41
Nb
Golongan
5
Periode
5
Blok
d
Proton
Elektron
Neutron
41
41
52
Sifat Umum
Nomor atom
41
Massa atom
92,90638
Nomor massa
93
Kategori
Logam transisi
Warna
Abu-abu
Radioaktif
Tidak
Named after Niobe, the daughter of Tantalu
Struktur kristal
Kubik Berpusat-badan
Sejarah
Niobium was discovered by the English chemist Charles Hatchett in 1801 and named the new element columbium.

In 1846, German chemist Henrich Rose independently discovered the element and named it niobium.

The metal was first isolated by Swedish scientist Christian Wilhelm Blomstrand in 1864 who reduced the chloride by heating it in a hydrogen atmosphere.
Elektron per kulit
2, 8, 18, 12, 1
Konfigurasi elektron
[Kr] 4d4 5s1
Nb
Brazil is the leading producer of niobium
Sifat Fisika
Fase
Solid
Kepadatan
8,57 g/cm3
Titik lebur
2750,15 K | 2477 °C | 4490,6 °F
Titik didih
5017,15 K | 4744 °C | 8571,2 °F
Kalor peleburan
26,8 kJ/mol
Kalor penguapan
690 kJ/mol
Kapasitas kalor molar
0,265 J/g·K
Kelimpahan di kerak bumi
0,0017%
Kelimpahan di alam semesta
2×10-7%
Ultrapure
Kredit Gambar: Images-of-elements
Ultrapure niobium bead, slightly oxidized
Nomor CAS
7440-03-1
PubChem CID Number
23936
Sifat Atom
Jari-jari atom
146 pm
Jari-jari kovalen
164 pm
Elektronegativitas
1,6 (Skala Pauling)
Potensi Ionisasi
6,7589 eV
Volume atom
10,87 cm3/mol
Kondusivitas termal
0,537 W/cm·K
Bilangan oksidasi
-1, 2, 3, 4, 5
Aplikasi
Niobium is used in arc-welding rods for stabilized grades of stainless steel.

Niobium alloys are strong and are often used in pipeline construction.

The metal is used in superalloys for jet engines and heat resistant equipment.

Niobium is found in many medical devices such as pacemakers.
Some niobium compounds are highly toxic
Isotop
Isotop stabil
93Nb
Isotop tidak stabil
81Nb, 82Nb, 83Nb, 84Nb, 85Nb, 86Nb, 87Nb, 88Nb, 89Nb, 90Nb, 91Nb, 92Nb, 94Nb, 95Nb, 96Nb, 97Nb, 98Nb, 99Nb, 100Nb, 101Nb, 102Nb, 103Nb, 104Nb, 105Nb, 106Nb, 107Nb, 108Nb, 109Nb, 110Nb, 111Nb, 112Nb, 113Nb