## Thorium |

Symbol | Th |
---|---|

Latin name | Thorium |

Atomic number | 90 |

Period | 7 |

Element category | Inner transition elements |

Relative atomic mass | 232.0381 |

Group | IV.B |

Electronegativity | 1.3 |

Oxidation numbers | 4 |

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^{10} 6s^{2} 6p^{6} 5f^{0} 6d^{2} 7s^{2} |

Density [g/cm^{3}] | 11.72 |

State | Solid |

Melting point [°C] | 1750 |

Boiling point [°C] | 4500 |

Thermal conductivity [W m^{-1}K^{-1}] | 54 |

Heat capacity [J K^{-1}g^{-1}] | 0.113 |

Discovery | 1828 |

Hardness [Mohs scale] | 3 |

Vickers hardness [MPa] | 350 |

Brinell hardness [MPa] | 400 |

Young's modulus [GPa] | 79 |

Electrical conductivity [S m^{-1}] | 6.7 · 10 ^{6} |

Shear modulus [GPa] | 31 |

1.st ionization energy [eV] | 6.08 |

2.nd ionization energy [eV] | 11.504 |

3.rd ionization energy [eV] | 20.003 |

Stable isotopes | 0 |

Unstable isotopes | 12 |