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Answer : The correct option is, (a) lose electrons and form a positive ionExplanation :Metals :These are the elements that easily loose electrons and forms cations.They require less energy to loose electrons because electrons are loosely bound to the nucleus.Non-metals :These are the elements that easily gain electrons to form an anion.They require more energy to loose electrons because the electrons are tightly bound to the nucleus.As per question, when a metal reacts with a nonmetal, the metal will lose electrons and form a positive ion and non-metal gain electrons and form a negative ion.Hence, the correct option is, (a)...