Question

adding of electron negative element (non metal)​

Answer 1

By convention, the negative sign shows a release of energy. When an electron is added to a metal element, energy is needed to gain that electron (endothermic reaction). ... It is easier to lose their valence electrons because metals' nuclei do not have a strong pull on their valence electrons.

Answer 2

Answer:

Nonmetals want to gain electrons because they have more valence electrons than metals, so it is easier for them to gain electrons than lose the valance electrons to fulfill a stable octet. In addition, nonmetals' valance electrons are closer to the nucleus, thus allowing more attraction between the two.

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