Тантал

73
Ta
Група
5
Периода
6
блок
d
Protons
Electrons
Neutrons
73
73
108
Општи Својства
Атомски број
73
Атомска тежина
180,94788
Mass Number
181
Category
Преоден метал
Color
Gray
Radioactive
Не
Named after Tantalos, a Greek mythological character, father of Niobe
Кристална структура
Body Centered Cubic
History
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.
Electrons per shell
2, 8, 18, 32, 11, 2
Електронска конфигурација
[Xe] 4f14 5d3 6s2
Ta
Tantalum occurs principally in the mineral columbite-tantalite
Физички Својства
Фаза
Solid
Густина
16,654 g/cm3
Точка на топење
3290,15 K | 3017 °C | 5462,6 °F
Точка на вриење
5731,15 K | 5458 °C | 9856,4 °F
Топлина на топење
36 kJ/mol
Топлина на испарување
735 kJ/mol
Specific Heat Capacity
0,14 J/g·K
Abundance in Earth's crust
0,00017%
Abundance in Universe
8×10-9%
Tantalum
Кредити на слика: Images-of-elements
Tantalum pieces
CAS Number
7440-25-7
PubChem CID Number
23956
Атомски Својства
Атомски полупречник
146 pm
Ковалентен полупречник
170 pm
Електронегативност
1,5 (Полингова скала)
Ionization Potential
7,5496 eV
Atomic Volume
10,90 cm3/mol
Thermal Conductivity
0,575 W/cm·K
Oxidation States
-1, 2, 3, 4, 5
Applications
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
Isotopes
Stable Isotopes
181Ta
Unstable Isotopes
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