Телур
52
Te
Група
16
Периода
5
блок
p
Протони
Електрони
Неутрони
52
52
76
Општи Својства
Атомски број
52
Атомска тежина
127,6
Масен број
128
Категорија
Металоид
Боја
Сребро
Радиоактивно
Не
From the Latin word tellus, earth
Кристална структура
Обично тригонално
Историја
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.
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.
Електрони на орбитала
2, 8, 18, 18, 6
Електронска конфигурација
[Kr] 4d10 5s2 5p4
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Физички Својства
Фаза
Цврста состојба
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
Специфичен топлински капацитет
0,202 J/g·K
Обилност во Земјината кора
9,9×10-8%
Обилност во Универзумот
9×10-7%
CAS број
13494-80-9
PubChem CID број
6327182
Атомски Својства
Атомски полупречник
140 pm
Ковалентен полупречник
138 pm
Електронегативност
2,1 (Полингова скала)
Јонизациски потенцијал
9,0096 eV
Атомски волумен
20,5 cm3/mol
Топлинска спроводливост
0,0235 W/cm·K
Оксидациски состојби
-2, 2, 4, 5, 6
Примени
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 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
Изотопи
Стабилни изотопи
120Te, 122Te, 124Te, 125Te, 126TeНестабилни изотопи
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