Телур
52
Te
Група
16
Периода
5
Блок
p
Протони
Електрони
Неутрони
52
52
76
Општа својства
Атомски број
52
Атомска маса
127,6
Масени број
128
Категорија
Металоиди
Боја
Сребрена
Радиоактиван
Не
From the Latin word tellus, earth
Кристална структура
Једноставни троугаони
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 по љусци
2, 8, 18, 18, 6
Електронска конфигурација
[Kr] 4d10 5s2 5p4
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Физичка својства
Стање
Чвсрто
Густина
6,232 g/cm3
Температура топљења
722,66 K | 449,51 °C | 841,12 °F
Температура кључања
1261,15 K | 988 °C | 1810,4 °F
Топлота топљења
17,5 kJ/mol
Топлота испаравања
48 kJ/mol
Специфична топлота
0,202 J/g·K
Заступљеност у Земљиној кори
9,9×10-8%
Заступљеност у Космосу
9×10-7%
CAS број
13494-80-9
ПубЦхем ЦИД број
6327182
Атомска својства
Атомски радијус
140 pm
Ковалентни радијус
138 pm
Електронегативност
2,1 (Полингова скала)
Јонизујући потенцијал
9,0096 eV
Молска запремина
20,5 cm3/mol
Топлотна проводљивост
0,0235 W/cm·K
Оксидациона стања
-2, 2, 4, 5, 6
Примена
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