Valence electrons

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A chemical reaction involves either electron removal, electron addition, or eletron sharing.

Valence electrons are the elctrons in the highest occupied principal energy level of an atom.In the second period elements, the two electrons in the 1s sublevel are called inner-shell electrons and are not involved directly in the elements reactivity in the formation of compounds.

They determine the reactivity of the atom and are located in the outer- shell.

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n stands for the principal energy level

Potassium, chlorine, nickel, calcium, xenon, uranium

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Valence electrons do take part in chemical bonds

Inner electrons don´t take part in chemical bonds.