## Zirconium |

Symbol | Zr |
---|---|

Latin name | Zirkonium |

Atomic number | 40 |

Period | 5 |

Element category | Transition elements |

Relative atomic mass | 91.244 |

Group | IV.B |

Electronegativity | 1.4 |

Oxidation numbers | 4 |

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

Density [g/cm^{3}] | 6.506 |

State | Solid |

Melting point [°C] | 1852 |

Boiling point [°C] | 3800 |

Atomic radius [pm] | 206 |

Covalent radius [pm] | 148 |

Thermal conductivity [W m^{-1}K^{-1}] | 22.7 |

Heat capacity [J K^{-1}g^{-1}] | 0.278 |

Discovery | 1789 |

Hardness [Mohs scale] | 5.0 |

Vickers hardness [MPa] | 903 |

Brinell hardness [MPa] | 650 |

Young's modulus [GPa] | 68 |

Electrical conductivity [S m^{-1}] | 2.3 · 10 ^{6} |

Shear modulus [GPa] | 33 |

1.st ionization energy [eV] | 6.6339 |

2.nd ionization energy [eV] | 13.13 |

3.rd ionization energy [eV] | 22.99 |

Stable isotopes | 5 |

Unstable isotopes | 16 |