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It is ionic. The dichromate ion, Cr2O72-, with the structure [O3Cr-O-CrO3]2-, consists of covalently bonded oxygen and chromium atoms (the electronegativities of Cr and O are 1.6 and 3.5, respectively, so the bonds are highly polar). This oxyanion is bonded ionically to magnesium ions, Mg2+. See Cotton and Wilkinson, Advanced Inorganic Chemistry, for more on the dichromate ion. Magnesium dichromate is the only alkaline earth dichromate that is appreciably soluble in water.

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15y ago
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11y ago

Magnesium bromide is an ionic compound, not covalent.

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13y ago

Magnesium chloride is ionic.

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Anonymous

Lvl 1
4y ago

It is ionic

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Q: Is magnesium chromate covalent or ionic?
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