What is a Period in a Periodic Table?
It's one of the rows that run from left to right. Elements in the same period have the same number of electron shells.
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A period in the periodic table is a horizontal row of elements. As you move from left to right, the atomic number increases.
I learned this in school: periods are the rows, and they indicate the number of electron energy levels in the atoms of those elements.
Think of it like this: periods are the horizontal lines, and each one tells you how many layers an element's electron cloud has.
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