Valence Electrons and the Periodic Table

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Where do electrons live in atoms? They live in energy levels or shells, which are varying distances from the nucleus,  and  can hold varying numbers of electrons. The most important electrons in an atom are the valence electrons, which are in the outermost energy level or shell. We’ll look at how to determine the number of valence electrons in an atom, based on which column it is in on the periodic table.

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