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Erudite1
Non-metals usually need more than two electrons to attain the octet structure, its not chemically economical to lose three or more electrons and it is difficult to get metals that will donate three or more electrons, so non-metals share electrons in order to attain octet structure.
scme1702
This is due to the ease with which electrons are lost. It is difficult for non-metals to lose a large number of electrons, so they rely on electron sharing to achieve stable configuration.

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