The number of valence electrons in an atom is 8 - 3 = 5 if it can fulfill an oct (8 electrons) by gaining 3 electrons.
Knowing an element's electrical arrangement will help you find its valence electrons. Following that, the total number the valence electrons in that chemical is determined by counting the electron in the outer shell.
Valence electrons are those who live in an atom's outermost shell. Because they influence an atom's reaction, valence electrons are significant. The number of electrons that occupy the highest energy level can be determined by writing the electron configuration.
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