Tallium

Kemiallinen merkki: Tl
Järjestysluku: 81
Kategoria: muut metallit
Ryhmä: 13
Jakso: 6
Lohko: p
Moolimassa: 204,3833 g/mol
Elektronia kuorilla: 2, 8, 18, 32, 18, 3
CAS-numero: 7440-28-0
Olomuoto: kiinteä
Tiheys: 11,85 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 577 K (304 °C, 579 °F)
Kiehumispiste: 1746 K (1473 °C, 2683 °F)
Kiderakenne: hexagonal
Hapetusluvut: 3, 1
Elektronegatiivisuus: 1,62 (Pauling-asteikko)
Nimen alkuperä: thallos
Nimen tarkoitus: a Greek word meaning 'a green shoot' - comes from thallium's bright green spectral emission lines
Faktoja:
- a soft gray malleable poor metal which resembles tin but discolors when exposed to air
- approximately 60-70% of thallium production is used in the electronics industry, and the rest is used in the pharmaceutical industry and in glass manuf
- is highly toxic and is used in rat poisons and insecticides, but its use has been cut back or eliminated in many countries
- because of its use for murder, thallium has gained the nicknames 'The Poisoner's Poison' and 'Inheritance Powder' (
- thallium metal is obtained as a by-product in the production of sulfuric acid by roasting of pyrite, and also in the smelting of lead and zinc ores