we know that metals and nonmetals react to form ionic compounds and do not have a covalent bond. then why is it so that in polyatomic ions chromate, chromium has a covalent bond with non metal oxygen?

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Solution

The metals in the middle of the periodic table have a less tendency to donate electrons as their electronegativity is more as compared to group1 and group 2 metals. Therefore, they are more likely to form covalent bonds by sharing electrons with non-metals. Due to the same reason, chromium is bonded to oxygen atoms by covalent bonds in chromate ion.

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