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iridium
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Iridium

osmiumiridiumplatina
Rh

Ir

Mt
Penampilan
putih keperakan
Two square pieces of gray foil
Ciri-ciri umum
Nama, lambang, Nomor atomiridium, Ir, 77
Dibaca/ɪˈrɪdiəm/
i-RID-ee-əm
Jenis unsur[[logam transisi]]
Golongan, periode, blok9, 6, d
Massa atom standar192.217
Konfigurasi elektron[Xe] 4f14 5d7 6s2
2, 8, 18, 32, 15, 2
Kulit elektron dari iridium (2, 8, 18, 32, 15, 2)
Sifat fisika
Fasesolid
Massa jenis (mendekati suhu kamar)22.56 g·cm−3
Massa jenis air pada t.l.19 g·cm−3
Titik lebur2739 K, 2466 °C, 4471 °F
Titik didih4701 K, 4428 °C, 8002 °F
Kalor peleburan41.12 kJ·mol−1
Kalor penguapan563 kJ·mol−1
Kapasitas kalor25.10 J·mol−1·K−1
Tekanan uap
P (Pa)1101001 k10 k100 k
at T (K)271329573252361440694659
Sifat atom
Bilangan oksidasi−3,−1, 0, 1, 2, 3, 4, 5, 6
Elektronegativitas2.20 (skala Pauling)
Energi ionisasipertama: 880 kJ·mol−1
ke-2: 1600 kJ·mol−1
Jari-jari atom136 pm
Jari-jari kovalen141±6 pm
Lain-lain
Susunan kristalface-centered cubic
Pembenahan magnetikparamagnetik[1]
Keterhambatan elektris(20 °C) 47.1 nΩ·m
Konduktivitas termal147 W·m−1·K−1
Ekspansi termal6.4 µm/(m·K)
Kecepatan suara (batang ringan)(20 °C) 4825 m·s−1
Modulus Young528 GPa
Modulus Shear210 GPa
Bulk modulus320 GPa
Rasio Poisson0.26
Kekerasan Mohs6.5
Kekerasan Viker1760 MPa
Kekerasan Brinell1670 MPa
Nomor CAS7439-88-5
Isotop paling stabil
Artikel utama: Isotop dari iridium
isoNAWaktu paruhDMDE (MeV)DP
188Irsyn1.73 dε1.64188Os
189Irsyn13.2 dε0.532189Os
190Irsyn11.8 dε2.000190Os
191Ir37.3%Ir stabil dengan 114 neutron
192Irsyn73.827 dβ1.460192Pt
ε1.046192Os
192m2Irsyn241 thnIT0.161192Ir
193Ir62.7%Ir stabil dengan 116 neutron
193mIrsyn10.5 hariIT0.080193Ir
194Irsyn19.3 hβ2.247194Pt
194m2Irsyn171 hariIT ?194Ir
· r


Iridium yaitu suatu unsur kimia dalam tabel periodik yang memiliki lambang Ir dan nomor atom 77.

Sumber acuan

  1. ^ Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (ke-86 ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5. 
 
 



Sumber :
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