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24 February, 06:08

Magnesium oxide is a binary ionic compound. From the formula MgO, how do you know that Mg is the metal?

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  1. 24 February, 08:41
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    See below.

    Step-by-step explanation:

    Method 1:

    You know that oxygen is a non-metal.

    If the compound is ionic, the oxygen must be combined with a metal.

    The Mg must be a metal.

    Method 2:

    In the formulas of ionic compounds, the positive ion (usually a metal) is written first.
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