What is period number of a periodic table equal to
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The row, or period, number that an element resides in on the table is equal to the number of total shells that contain electrons in the atom. H and He in the first period normally have electrons in only the first shell; Li, Be, B, and other period-two elements have two shells occupied, and so on.
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Tye row number that an element resides on the table is equal to the number of total shells that contain electrons in that atom.
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