## Lutetium |

Symbol | Lu |
---|---|

Latin name | Lutecium |

Atomic number | 71 |

Period | 6 |

Element category | Inner transition elements |

Relative atomic mass | 174.967 |

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^{14} 5d^{1} 6s^{2} |

Density [g/cm^{3}] | 9.842 |

State | Solid |

Melting point [°C] | 1663 |

Boiling point [°C] | 3395 |

Atomic radius [pm] | 217 |

Covalent radius [pm] | 160 |

Thermal conductivity [W m^{-1}K^{-1}] | 16.4 |

Heat capacity [J K^{-1}g^{-1}] | 0.15 |

Discovery | 1907 |

Vickers hardness [MPa] | 1160 |

Brinell hardness [MPa] | 893 |

Young's modulus [GPa] | 69 |

Electrical conductivity [S m^{-1}] | 1.8 · 10 ^{6} |

Shear modulus [GPa] | 27 |

1.st ionization energy [eV] | 5.4259 |

2.nd ionization energy [eV] | 13.888 |

3.rd ionization energy [eV] | 20.957 |

Stable isotopes | 2 |

Unstable isotopes | 21 |