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A period on the Periodic Table is a horizontal row of elements. As we look across a given row of elements, we see atomic number increasing by one for each element we encounter. Further, what we are looking at is the "filling in" of the electron shells leading up to a completely full outer shell for the element at the far right of the period. No elements in a period have a full outer electron shell (valence shell) except the last one. We then start over with the next higher atomic number and begin a new period of the periodic table. Use the link below to check facts and learn more.

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13y ago

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