Tellur
52
Te
Gruppe
16
Periode
5
Blokk
p
Protons
Electrons
Neutrons
52
52
76
Generelle eigenskapar
Atomnummer
52
Atommasse
127,6
Mass Number
128
Kategori
Halvmetall
Farge
Silver
Radioactive
Nei
From the Latin word tellus, earth
Krystallstruktur
Simple Trigonal
Historie
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.
Elektron per energinivå
2, 8, 18, 18, 6
Elektronkonfigurasjon
[Kr] 4d10 5s2 5p4
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
6,232 g/cm3
Smeltepunkt
722,66 K | 449,51 °C | 841,12 °F
Kokepunkt
1261,15 K | 988 °C | 1810,4 °F
Smeltevarme
17,5 kJ/mol
Fordampingsvarme
48 kJ/mol
Spesifikk varmekapasitet
0,202 J/g·K
Abundance in Earth's crust
9,9×10-8%
Abundance in Universe
9×10-7%
CAS Number
13494-80-9
PubChem CID Number
6327182
Atom eigenskapar
Atomradius
140 pm
Kovalent radius
138 pm
Elektronegativitet
2,1 (Paulings skala)
Ioniseringspotensial
9,0096 eV
Molart volum
20,5 cm3/mol
Termisk konduktivitet
0,0235 W/cm·K
Oksidasjonstrinn
-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 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, 126TeUnstable 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