iridium

iridium (chemical element)

Periodic table location

Image

atomic symbol | Ir atomic number | 77 short electronic configuration | [Xe]6s^24f^145d^7 Aufbau diagram | 5d 4f 6s block | d group | 9 period | 6 atomic mass | 192.217 u (unified atomic mass units)

phase at STP | solid melting point | 2466 °C (rank: 8th) boiling point | 4428 °C (rank: 9th) molar heat of fusion | 26 kJ/mol (rank: 12th) molar heat of vaporization | 560 kJ/mol (rank: 11th) specific heat at STP | 131 J/(kg K) (rank: 76th) (properties at standard conditions)

density | 22.56 g/cm^3 (rank: 2nd) liquid density | 19 g/cm^3 molar volume | 8.52 cm^3/mol Mohs hardness | 6.5 (between microcline and quartz) Vickers hardness | 1760 MPa (rank: 9th) Brinell hardness | 1670 MPa (rank: 8th) bulk modulus | 320 GPa (rank: 3rd) shear modulus | 210 GPa Young's modulus | 528 GPa (rank: 1st) Poisson ratio | 0.26 (rank: 36th) sound speed | 4825 m/s (rank: 15th) thermal expansion | 6.4×10^-6 K^(-1) (rank: 51st) thermal conductivity | 150 W/(m K) (rank: 9th) (properties at standard conditions)

electrical type | conductor resistivity | 4.7×10^-8 Ω m (ohm meters) electrical conductivity | 2.1×10^7 S/m (siemens per meter) magnetic type | paramagnetic volume magnetic susceptibility | 3.77×10^-5 mass magnetic susceptibility | 1.67×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 3.21×10^-10 m^3/mol (cubic meters per mole) work function | (5 to 5.76) eV threshold frequency | (1.209×10^15 to 1.393×10^15) Hz (hertz) superconducting point | 0.11 K (kelvins) color | (silver) (work function range from 4 different crystalline orientations)

valence | 6 electronegativity | 2.2 electron affinity | 151 kJ/mol (kilojoules per mole) first ionization energy | 880 kJ/mol (kilojoules per mole) ionization energies | 880 kJ/mol | 1600 kJ/mol

Reactivity

term symbol | ^4F_(9/2) atomic radius | 135 pm covalent radius | 141 pm (electronic ground state properties)

(neutral iridium atomic spectrum)

universe abundance | 2×10^-7 mass% (rank: 51st) solar abundance | 2×10^-7 mass% (rank: 50th) meteorite abundance | 5.4×10^-5 mass% (rank: 46th) crust abundance | 4×10^-8 mass% (rank: 81st) universe molar abundance | 1×10^-9 mol% (rank: 59th) solar molar abundance | 9.9×10^-10 mol% (rank: 53rd) meteorite molar abundance | 6×10^-6 mol% (rank: 48th) crust molar abundance | 5×10^-9 mol% (rank: 82nd)

half-life | (stable) stable isotopes | Ir-193 (62.7%) | Ir-191 (37.3%) nuclear spin | Ir-164: 2^- | Ir-165: 1/2^+ | Ir-166: 2^- | Ir-167: 1/2^+ | Ir-169: 1/2^+ | Ir-170: 3^- | Ir-171: 1/2^+ | Ir-172: 3^+ | Ir-174: 3^+ | Ir-175: 5/2^- | Ir-177: 5/2^- | Ir-179: 5/2^- | Ir-181: 5/2^- | Ir-182: 5^+ | Ir-183: 5/2^- | Ir-184: 5^- | Ir-185: 5/2^- | Ir-186: 5^+ | Ir-187: 3/2^+ | Ir-188: 1^- | Ir-189: 3/2^+ | Ir-190: 4^- | Ir-191: 3/2^+ | Ir-192: 4^+ | Ir-193: 3/2^+ | Ir-194: 1^- | Ir-195: 3/2^+ | Ir-196: 0^- | Ir-197: 3/2^+ | Ir-199: 3/2^+ unstable isotopes | Ir-192 (73.828 days) | Ir-189 (13.2 days) | Ir-190 (11.78 days) | Ir-188 (41.5 h) | Ir-194 (19.281 h) | Ir-186 (16.6 h) | Ir-185 (14.4 h) | Ir-187 (10.5 h) | Ir-184 (185 min) | Ir-195 (150 min) | Ir-183 (57 min) | Ir-182 (15 min) | Ir-197 (5.83 min) | Ir-181 (4.9 min) | Ir-180 (90 s) | Ir-179 (79 s) | Ir-196 (52 s) | Ir-177 (30 s) | Ir-178 (12 s) | Ir-175 (9 s) | Ir-173 (9 s) | Ir-176 (8.7 s) | Ir-198 (8 s) | Ir-174 (7.9 s) | Ir-199 (6 s) | Ir-172 (4.4 s) | Ir-171 (3.2 s) | Ir-170 (870 ms) | Ir-169 (353 ms) | Ir-167 (35.2 ms) | Ir-166 (10.5 ms) | Ir-164 (1 ms) | Ir-168 (161 µs) | Ir-165 (1 µs) neutron cross-section | 425 b neutron mass absorption | 0.08 m^2/kg

CAS number | 7439-88-5 PubChem CID number | 23924