Iridio
77
Ir
Grupo
9
Perio
6
Bloko
d
Protonoj
Elektronoj
Neŭtronoj
77
77
115
Ĝeneralaj Propraĵoj
Atoma Nombro
77
Atommaso
192,217
Amasa Nombro
192
Kategorio
Transirmetaloj
Koloro
Arĝento
Radioaktiva
Ne
From the Latin word iris meaning rainbow
Kristala Strukturo
Vizaĝo Centrita Kubo
Historio
Iridium was discovered in 1803 by English chemist Smithson Tennant in London.
Chemists who studied platinum dissolved it in aqua regia to create soluble salts and observed a small amount of a dark, insoluble residue.
Smithson Tennant analyzed the insoluble residue and concluded that it must contain a new metal.
Chemists who studied platinum dissolved it in aqua regia to create soluble salts and observed a small amount of a dark, insoluble residue.
Smithson Tennant analyzed the insoluble residue and concluded that it must contain a new metal.
Elektronoj per ŝelo
2, 8, 18, 32, 15, 2
Elektrona Agordo
[Xe] 4f14 5d7 6s2
Iridium is the most corrosion-resistant metal known
Fizikaj Propraĵoj
Fazo
Solido
Denso
22,56 g/cm3
Fandpunkto
2739,15 K | 2466 °C | 4470,8 °F
Bolpunkto
4701,15 K | 4428 °C | 8002,4 °F
Varmo de Fuzio
26 kJ/mol
Varmo de Vaporiĝo
560 kJ/mol
Specifa Varmo Kapacito
0,131 J/g·K
Krusta Abundo
4×10-8%
Universa Abundo
2×10-7%
CAS Nombro
7439-88-5
PubChem Kunmetita Identiga Nombro
23924
Atomaj Propraĵoj
Atoma Radiuso
136 pm
Kovalenta Radiuso
141 pm
Elektronegativeco
2,2 (Pauling-skalo)
Potencialo de jonigo
8,967 eV
Atoma Volumo
8,54 cm3/mol
Termika Kondukto
1,47 W/cm·K
Oksidaj Ŝtatoj
-3, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9
Aplikoj
Iridium is used in making crucibles and other equipment that is used at high temperatures.
Iridium is also used as a hardening agent in platinum alloys.
Its resistance to arc erosion makes iridium alloys ideal for electrical contacts for spark plugs.
Radioactive isotopes of iridium are used in radiation therapy for the treatment of cancer.
Iridium is also used as a hardening agent in platinum alloys.
Its resistance to arc erosion makes iridium alloys ideal for electrical contacts for spark plugs.
Radioactive isotopes of iridium are used in radiation therapy for the treatment of cancer.
Iridium is considered to be of low toxicity
Izotopoj
Stabilaj Izotopoj
191Ir, 193IrMalstabilaj Isotopoj
164Ir, 165Ir, 166Ir, 167Ir, 168Ir, 169Ir, 170Ir, 171Ir, 172Ir, 173Ir, 174Ir, 175Ir, 176Ir, 177Ir, 178Ir, 179Ir, 180Ir, 181Ir, 182Ir, 183Ir, 184Ir, 185Ir, 186Ir, 187Ir, 188Ir, 189Ir, 190Ir, 192Ir, 194Ir, 195Ir, 196Ir, 197Ir, 198Ir, 199Ir