## Iridium |

Symbol | Ir |
---|---|

Latin name | Iridium |

Atomic number | 77 |

Period | 6 |

Element category | Transition elements |

Relative atomic mass | 192.22 |

Group | VIII.B |

Electronegativity | 2.2 |

Oxidation numbers | 2, 3, 4, 6 |

Electron configuration | 1s ^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 5s^{2} 5p^{6} 4f^{14} 5d^{7} 6s^{2} |

Density [g/cm^{3}] | 22.5 |

State | Solid |

Melting point [°C] | 2447 |

Boiling point [°C] | 4500 |

Atomic radius [pm] | 180 |

Covalent radius [pm] | 137 |

Thermal conductivity [W m^{-1}K^{-1}] | 147 |

Heat capacity [J K^{-1}g^{-1}] | 0.13 |

Discovery | 1803 |

Hardness [Mohs scale] | 6.5 |

Vickers hardness [MPa] | 1760 |

Brinell hardness [MPa] | 1670 |

Young's modulus [GPa] | 528 |

Electrical conductivity [S m^{-1}] | 2.1 · 10 ^{7} |

Shear modulus [GPa] | 210 |

1.st ionization energy [eV] | 9.1 |

Stable isotopes | 2 |

Unstable isotopes | 23 |