Question

why metals loses and nonmetals gain electrons

Answer 1

Metals: Metals like to lose valenceelectrons to form cations to have a fully stable octet. They absorb energy (endothermic) to lose electrons. Theelectron affinity of metals is lower than that of nonmetals. Nonmetals:Nonmetals like to gain electrons to form anions to have a fully stable octet.
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Answer 2

Because metals have free electron and non metals have less electron to complete its octate.