Please tell that need help urgent. I can make him brainlist who tell me all the answers. Please help
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(2)By the number of electrons present in outmost shell
(3) An ionic compound is between a metal and nonmetal and covalent is between two nonmetals . So you can check by looking periodic table .
(4) Valency is a number of electrons that an atom of an element gain or lose to attain Noble gas configuration
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