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How can the periodic table be used to infer the number of valence electrons in an atom?
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How can the periodic table be used to infer the number of valence electrons in an atom?

User Tobias Xy
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Beside each element on the right upper side is the number of electrons in each energy level starting from the first energy level to the last going in order from top to bottom, the number of valence electrons would be the last one.
User Leocrimson
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