Period
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Example:
Imagine trying to organize a bookshelf where each book is a different genre but organized by the height of the book rather than the content. Just like how you arrange these books from left to right by height, a period on the periodic table arranges elements in a horizontal row, ordered by increasing atomic number. Each element in a period is like a book on your shelf, differing in properties but aligned by a systematic increase in atomic structure, much like your books are organized by their physical size rather than their story content.
Practice Version
Period: A horizontal row of elements of the periodic table. period. In Science, a period is a row in the periodic table where elements have the same number of electron shells.