## Barium |

Symbol | Ba |
---|---|

Latin name | Baryum |

Atomic number | 56 |

Period | 6 |

Element category | Alkaline earth metals |

Relative atomic mass | 137.327 |

Group | II.A |

Electronegativity | 0.9 |

Oxidation numbers | 2 |

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

Density [g/cm^{3}] | 3.5 |

State | Solid |

Melting point [°C] | 725 |

Boiling point [°C] | 1640 |

Thermal conductivity [W m^{-1}K^{-1}] | 18.4 |

Heat capacity [J K^{-1}g^{-1}] | 0.204 |

Discovery | 1808 |

Hardness [Mohs scale] | 1.25 |

Young's modulus [GPa] | 13 |

Electrical conductivity [S m^{-1}] | 2.8 · 10 ^{6} |

Shear modulus [GPa] | 4.9 |

1.st ionization energy [eV] | 5.2117 |

2.nd ionization energy [eV] | 10.004 |

Stable isotopes | 7 |

Unstable isotopes | 17 |