## Holmium |

Symbol | Ho |
---|---|

Latin name | Holmium |

Atomic number | 67 |

Period | 6 |

Element category | Inner transition elements |

Relative atomic mass | 164.93032 |

Group | III.B |

Electronegativity | 1.2 |

Oxidation numbers | 3 |

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^{11} 5d^{0} 6s^{2} |

Density [g/cm^{3}] | 8.8 |

State | Solid |

Melting point [°C] | 1474 |

Boiling point [°C] | 2695 |

Atomic radius [pm] | 175 |

Covalent radius [pm] | 192 |

Thermal conductivity [W m^{-1}K^{-1}] | 16.2 |

Heat capacity [J K^{-1}g^{-1}] | 0.165 |

Discovery | 1879 |

Vickers hardness [MPa] | 481 |

Brinell hardness [MPa] | 746 |

Young's modulus [GPa] | 65 |

Electrical conductivity [S m^{-1}] | 1.1 · 10 ^{6} |

Shear modulus [GPa] | 26 |

1.st ionization energy [eV] | 6.0216 |

2.nd ionization energy [eV] | 11.805 |

3.rd ionization energy [eV] | 22.843 |

Stable isotopes | 1 |

Unstable isotopes | 28 |