Telur

52
Te
Skupina
16
Perioda
5
Blok
p
Protons
Electrons
Neutrons
52
52
76
General Properties
Vrstno število
52
Atomska teža
127,6
Mass Number
128
Kategorija
Polkovine
Barva
Silver
Radioactive
Ne
From the Latin word tellus, earth
Kristalna struktura
Simple Trigonal
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.
Electrons per shell
2, 8, 18, 18, 6
Razporeditev elektronov
[Kr] 4d10 5s2 5p4
Te
In air, tellurium burns with a greenish-blue flames, forming the dioxide
Physical Properties
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
Abundance in Earth's crust
9,9×10-8%
Abundance in Universe
9×10-7%
Metallic
Zasluge za slike: Images-of-elements
Metallic tellurium
CAS Number
13494-80-9
PubChem CID Number
6327182
Atomic Properties
Atomski polmer
140 pm
Kovalentni polmer
138 pm
Elektronegativnost
2,1 (Paulingova lestvica)
Ionization Potential
9,0096 eV
Atomic Volume
20,5 cm3/mol
Toplotna prevodnost
0,0235 W/cm·K
Oksidacijska stanja
-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