## Praseodymium |

Symbol | Pr |
---|---|

Latin name | Praseodymium |

Atomic number | 59 |

Period | 6 |

Element category | Inner transition elements |

Relative atomic mass | 140.90765 |

Group | III.B |

Electronegativity | 1.2 |

Oxidation numbers | 3, 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^{3} 5d^{0} 6s^{2} |

Density [g/cm^{3}] | 6.773 |

State | Solid |

Melting point [°C] | 931 |

Boiling point [°C] | 3212 |

Atomic radius [pm] | 247 |

Covalent radius [pm] | 164 |

Thermal conductivity [W m^{-1}K^{-1}] | 12.5 |

Heat capacity [J K^{-1}g^{-1}] | 0.193 |

Discovery | 1885 |

Vickers hardness [MPa] | 400 |

Brinell hardness [MPa] | 481 |

Young's modulus [GPa] | 37 |

Electrical conductivity [S m^{-1}] | 1.4 · 10 ^{6} |

Shear modulus [GPa] | 15 |

1.st ionization energy [eV] | 5.464 |

2.nd ionization energy [eV] | 10.551 |

3.rd ionization energy [eV] | 21.62 |

Stable isotopes | 1 |

Unstable isotopes | 14 |