Iridium

77
Ir
Kumpulan
9
Kala
6
Blok
d
Proton
Elektron
Neutron
77
77
115
Ciri-Ciri Am
Nombor atom
77
Berat atom
192.217
Nombor jisim
192
Kategori
Logam peralihan
Warna
Perak
Radioaktif
Tidak
From the Latin word iris meaning rainbow
Struktur hablur
Pusat Wajah Kubik
Sejarah
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.
Bilangan elektron per petala
2, 8, 18, 32, 15, 2
Konfigurasi elektron
[Xe] 4f14 5d7 6s2
Ir
Iridium is the most corrosion-resistant metal known
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
22.56 g/cm3
Takat lebur
2739.15 K | 2466 °C | 4470.8 °F
Takat didih
4701.15 K | 4428 °C | 8002.4 °F
Haba pelakuran
26 kJ/mol
Haba pengewapan
560 kJ/mol
Muatan haba molar
0.131 J/g·K
Banyak pada kerak bumi
4×10-8%
Banyak pada alam semesta
2×10-7%
Pieces
Kredit imej: Images-of-elements
Pieces of pure iridium
Nombor CAS
7439-88-5
PubChem CID Number
23924
Ciri-Ciri Atom
Jejari atom
136 pm
Jejari kovalen
141 pm
Keelektronegatifan
2.2 (Skala Pauling)
Kebolehan mengion
8.967 eV
Isipadu atom
8.54 cm3/mol
Daya pengaliran terma
1.47 W/cm·K
Keadaan pengoksidaan
-3, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9
Aplikasi
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 considered to be of low toxicity
Isotop
Isotop stabil
191Ir, 193Ir
Isotop tidak stabil
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