Телур

52
Te
Група
16
Периода
5
блок
p
Protons
Electrons
Neutrons
52
52
76
Општи Својства
Атомски број
52
Атомска тежина
127,6
Mass Number
128
Category
Металоид
Color
Silver
Radioactive
Не
From the Latin word tellus, earth
Кристална структура
Simple Trigonal
History
Tellurium was discovered in Transylvania in 1782 by Franz-Joseph Müller von Reichenstein in a mineral containing tellurium and gold.

In 1789, another Hungarian scientist, Pál Kitaibel, also discovered the element independently in an ore from Deutsch-Pilsen which had been regarded as argentiferous molybdenite.

In 1798, it was named by Martin Heinrich Klaproth who earlier isolated it from the mineral calaverite.
Electrons per shell
2, 8, 18, 18, 6
Електронска конфигурација
[Kr] 4d10 5s2 5p4
Te
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Физички Својства
Фаза
Solid
Густина
6,232 g/cm3
Точка на топење
722,66 K | 449,51 °C | 841,12 °F
Точка на вриење
1261,15 K | 988 °C | 1810,4 °F
Топлина на топење
17,5 kJ/mol
Топлина на испарување
48 kJ/mol
Specific Heat Capacity
0,202 J/g·K
Abundance in Earth's crust
9,9×10-8%
Abundance in Universe
9×10-7%
Metallic
Кредити на слика: Images-of-elements
Metallic tellurium
CAS Number
13494-80-9
PubChem CID Number
6327182
Атомски Својства
Атомски полупречник
140 pm
Ковалентен полупречник
138 pm
Електронегативност
2,1 (Полингова скала)
Ionization Potential
9,0096 eV
Atomic Volume
20,5 cm3/mol
Thermal Conductivity
0,0235 W/cm·K
Oxidation States
-2, 2, 4, 5, 6
Applications
The primary use of tellurium is in alloys, foremost in steel and copper to improve machinability.

Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for chill control.

It is used in vulcanizing rubber and in catalysts for petroleum cracking.

Tellurium is used as a coloring agent in ceramics.
Tellurium and tellurium compounds are considered to be mildly toxic
Isotopes
Stable Isotopes
120Te, 122Te, 124Te, 125Te, 126Te
Unstable Isotopes
105Te, 106Te, 107Te, 108Te, 109Te, 110Te, 111Te, 112Te, 113Te, 114Te, 115Te, 116Te, 117Te, 118Te, 119Te, 121Te, 123Te, 127Te, 128Te, 129Te, 130Te, 131Te, 132Te, 133Te, 134Te, 135Te, 136Te, 137Te, 138Te, 139Te, 140Te, 141Te, 142Te