Iridium, 77 Iridium Pípè / ɪ ˈ r ɪ d i ə m / (i-RID -ee-əm Ìhànsójú silvery white Ìwúwo átọ̀mù A r, std (Ir) 192.217(2) Iridium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 77 Ẹgbẹ́ group 9 Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metalÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f14 5d7 6s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 32, 15, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 2739 K (2466 °C, 4471 °F) Ígbà ìhó 4701 K (4428 °C, 8002 °F) Kíki (near r.t. ) 22.56 g/cm3 when liquid (at m.p. ) 19 g/cm3 Heat of fusion 41.12 kJ/mol Heat of 563 kJ/mol Molar heat capacity 25.10 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2713 2957 3252 3614 4069 4659
Atomic properties Oxidation states −3, −1, 0, +1, +2, +3 +4 Electronegativity Pauling scale: 2.20 Atomic radius empirical: 136 pm Covalent radius 141±6 pm Color lines in a spectral range Spectral lines of iridium Other properties Natural occurrence primordial Crystal structure (fcc) Speed of sound thin rod 4825 m/s (at 20 °C) Thermal expansion 6.4 µm/(m·K) Thermal conductivity 147 W/(m·K) Electrical resistivity 47.1 n Ω·m (at 20 °C) Magnetic ordering paramagnetic Young's modulus 528 GPa Shear modulus 210 GPa Bulk modulus 320 GPa Poisson ratio 0.26 Mohs hardness 6.5 Vickers hardness 1760 MPa Brinell hardness 1670 MPa CAS Number 7439-88-5 Main isotopes of iridium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 188 Ir syn 1.73 d ε 1.64 188 Os 189 Ir syn 13.2 d ε 0.532 189 Os 190 Ir syn 11.8 d ε 2.000 190 Os 191 Ir 37.3% 191 Ir is stable with 114 neutrons 192 Ir syn 73.827 d β- 1.460 192 Pt ε 1.046 192 Os 192m2 Ir syn 241 y IT 0.161 192 Ir 193 Ir 62.7% 193 Ir is stable with 116 neutrons 193m Ir syn 10.5 d IT 0.080 193 Ir 194 Ir syn 19.3 h β- 2.247 194 Pt 194m2 Ir syn 171 d IT ? 194 Ir
Àdàkọ:Category-inline
Itokasi
This article uses material from the Wikipedia Yorùbá article Iridium , which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0") ; additional terms may apply (view authors ). Gbogbo ohun inú ibí yìí wà lábẹ́ CC BY-SA 4.0 àyàfi tí a bá sọ pé kò rí bẹ̀ẹ̀. Images, videos and audio are available under their respective licenses. Wiki Yorùbá (DUHOCTRUNGQUOC.VN) is an independent company and has no affiliation with Wiki Foundation.
