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4 January, 04:24

Why did it require two sodium atoms to complete the Na2O formula unit? Na has + 2 charge and O has - 1 charge. Na has + 1 charge and O has - 2 charge. Na has - 2 charge and O has + 1 charge.

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  1. 4 January, 07:51
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    Na₂O is an ionic compound. Na is in group 1 which means it has one electron in the outer shell. O is in group 6 so it has 6 electrons in the outer shell.

    To become stable atoms need to either lose the electrons in the outer shell or gain electrons to gain a complete outer shell configuration.

    To become stable Na loses its outer electron and becomes positively charged. It only loses one electron, so net charge is + 1. O to become stable gains 2 electrons to complete its outer shell and becomes negatively charged. since it gains 2 electrons, the net charge is - 2.

    cation - Na⁺

    anion - O²⁻

    O gains 2 electrons but Na can give only one electron, therefore 2 Na⁺ ions are required.

    the compound can be written by exchanging the charges

    ions Na⁺ O²⁻

    charge + 1 - 2

    exchange Na₂O

    Correct answer is Na has + 1 charge and O has - 2 charge
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