Kulta

Kemiallinen merkki: Au
Järjestysluku: 79
Kategoria: siirtymämetallit
Ryhmä: 11
Jakso: 6
Lohko: d
Moolimassa: 196,966569 g/mol
Elektronia kuorilla: 2, 8, 18, 32, 18, 1
CAS-numero: 7440-57-5
Olomuoto: kiinteä
Tiheys: 19,3 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1337,33 K (1064,18 °C, 1947,52 °F)
Kiehumispiste: 3129 K (2856 °C, 5173 °F)
Kiderakenne: face centered cubic
Hapetusluvut: -1, 1, 2, 3, 4, 5
Elektronegatiivisuus: 2,54 (Pauling-asteikko)
Nimen alkuperä: Aurum
Nimen tarkoitus: glowing dawn, due to its color
Faktoja:
- occurs as nuggets or grains in rocks, in veins and in alluvial deposits
- is dense, soft, shiny and the most malleable and ductile pure metal known
- dissolves in mercury, forming amalgam alloys, but does not react with it
- a single gram can be beaten into a sheet of one square meter, or an ounce into 300 square feet
- modern uses include dentistry and electronics, where gold has traditionally found use because of its good resistance to oxidative corrosion
- is non-toxic and non-irritating when ingested and is sometimes used
- is also a component of the alcoholic drinks Goldschläger, Gold Strike, and Goldwasser
- gold is approved as a food additive in the EU