Tantalum

73
Ta
Golongan
5
Periode
6
Blok
d
Proton
Elektron
Neutron
73
73
108
Sifat Umum
Nomor atom
73
Massa atom
180,94788
Nomor massa
181
Kategori
Logam transisi
Warna
Abu-abu
Radioaktif
Tidak
Named after Tantalos, a Greek mythological character, father of Niobe
Struktur kristal
Kubik Berpusat-badan
Sejarah
Tantalum was discovered in Sweden in 1802 by Anders Ekeberg in the minerals tantalite from Finland and yttrotantalite from Sweden.

Unfortunately, William Hyde Wollaston claimed Ekeberg's new element was actually niobium, which had also been discovered in 1802.

In 1846, German chemist Heinrich Rose finally proved beyond doubt that tantalum and niobium were different elements.
Elektron per kulit
2, 8, 18, 32, 11, 2
Konfigurasi elektron
[Xe] 4f14 5d3 6s2
Ta
Tantalum occurs principally in the mineral columbite-tantalite
Sifat Fisika
Fase
Solid
Kepadatan
16,654 g/cm3
Titik lebur
3290,15 K | 3017 °C | 5462,6 °F
Titik didih
5731,15 K | 5458 °C | 9856,4 °F
Kalor peleburan
36 kJ/mol
Kalor penguapan
735 kJ/mol
Kapasitas kalor molar
0,14 J/g·K
Kelimpahan di kerak bumi
0,00017%
Kelimpahan di alam semesta
8×10-9%
Tantalum
Kredit Gambar: Images-of-elements
Tantalum pieces
Nomor CAS
7440-25-7
PubChem CID Number
23956
Sifat Atom
Jari-jari atom
146 pm
Jari-jari kovalen
170 pm
Elektronegativitas
1,5 (Skala Pauling)
Potensi Ionisasi
7,5496 eV
Volume atom
10,90 cm3/mol
Kondusivitas termal
0,575 W/cm·K
Bilangan oksidasi
-1, 2, 3, 4, 5
Aplikasi
Tantalum is used in the electronics industry for capacitors and high power resistors.

The high melting point and oxidation resistance lead to the use of the metal in the production of vacuum furnace parts.

Tantalum oxide is used to make special glass with high index of refraction for camera lenses.
Tantalum is considered to be non-toxic
Isotop
Isotop stabil
181Ta
Isotop tidak stabil
155Ta, 156Ta, 157Ta, 158Ta, 159Ta, 160Ta, 161Ta, 162Ta, 163Ta, 164Ta, 165Ta, 166Ta, 167Ta, 168Ta, 169Ta, 170Ta, 171Ta, 172Ta, 173Ta, 174Ta, 175Ta, 176Ta, 177Ta, 178Ta, 179Ta, 180Ta, 182Ta, 183Ta, 184Ta, 185Ta, 186Ta, 187Ta, 188Ta, 189Ta, 190Ta