Answer:
[Valence electrons?]
-Arguably the most important electrons in an atom, especially from a chemical bonding perspective. They constituent the outermost shell of electrons in an atom, generally a group of 2 or 8.
Additionally, it is preferable, from the "perspective" of an atom, for the valence shell to be completely filled, which is a basic principle that is often used for determining bonding behavior between different particles. Atoms and molecules will tend to bond so that their valence shells are filled, with metals commonly losing electrons and nonmetals commonly gaining electrons.
As an example, in the case of fluorine, which has 7 valence electrons, it will tend to bond with atoms or compounds able to give it one extra electron (most often metals) so that it can achieve a full valence shell.
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