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8 August, 17:54

Name the noble gas atom that has the same electron configuration as each ion in the compound rubidium oxide

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  1. 8 August, 20:41
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    In rubidium oxide - Rb₂O, the ions are Rb⁺ and O²⁻

    Rb is a group one element with one valence electron. To become stable it loses its outer electron to gain a complete outer shell.

    Electronic configuration of Rb is - 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s¹

    Once it loses its valence electron the configuration is;

    - 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶

    The noble gas with this configuration is Krypton - Kr

    Oxygen electron configuration is 1s² 2s² 2p⁴

    Once it gains 2 electrons the configuration is - 1s² 2s² 3p⁶

    The noble gas with this configuration is Neon - Ne
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