Telur
52
Te
Skupina
16
Perioda
5
Blok
p
Protoni
Elektroni
Nevtroni
52
52
76
Splošne lastnosti
Vrstno število
52
Atomska teža
127,6
Masno število
128
Kategorija
Polkovine
Barva
Srebrna
Radioaktivno
Ne
From the Latin word tellus, earth
Kristalna struktura
Enostavna trigonalna
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 18, 6
Razporeditev elektronov
[Kr] 4d10 5s2 5p4
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
6,232 g/cm3
Tališče
722,66 K | 449,51 °C | 841,12 °F
Vrelišče
1261,15 K | 988 °C | 1810,4 °F
Talilna toplota
17,5 kJ/mol
Izparilna toplota
48 kJ/mol
Toplotna kapaciteta
0,202 J/g·K
Zastopanost v Zemljini skorji
9,9×10-8%
Zastopanost v vesolju
9×10-7%
CAS številka
13494-80-9
PubChem CID številka
6327182
Atomske lastnosti
Atomski polmer
140 pm
Kovalentni polmer
138 pm
Elektronegativnost
2,1 (Paulingova lestvica)
Ionizacijski potencial
9,0096 eV
Atomski volumen
20,5 cm3/mol
Toplotna prevodnost
0,0235 W/cm·K
Oksidacijska stanja
-2, 2, 4, 5, 6
Uporabe
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
Izotopi
Stabilni izotopi
120Te, 122Te, 124Te, 125Te, 126TeNestabilni izotopi
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