## Iodine |

Symbol | I |
---|---|

Latin name | Iodium |

Atomic number | 53 |

Period | 5 |

Element category | Halogens |

Relative atomic mass | 126.90447 |

Group | VII.A |

Electronegativity | 2.5 |

Oxidation numbers | -1, 1, 3, 5, 7 |

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

Density [g/cm^{3}] | 4.93 |

State | Solid |

Melting point [°C] | 113.5 |

Boiling point [°C] | 184.35 |

Critical point [°C] | 546 |

Critical pressure [MPa] | 11.7 |

Atomic radius [pm] | 115 |

Covalent radius [pm] | 133 |

Thermal conductivity [W m^{-1}K^{-1}] | 0.449 |

Heat capacity [J K^{-1}g^{-1}] | 0.145 |

Discovery | 1811 |

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

1.st ionization energy [eV] | 10.4513 |

2.nd ionization energy [eV] | 19.131 |

3.rd ionization energy [eV] | 33.0 |

Stable isotopes | 1 |

Unstable isotopes | 23 |