16 Captivating Facts About Period (Periodic Table) - Facts.net
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Periodic Table Groups vs. Periods | Properties & History - Lesson | Study.com
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Periodic Table Groups and Periods
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Groups and periods - The periodic table - GCSE Chemistry (Single Science) Revision - WJEC - BBC Bitesize
Periodicity
Periodic table - Elements, Groups, Blocks | Britannica
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What are the periods and groups of the periodic table? How are they used? - Quora
Period (periodic table) - Wikipedia
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The Structure and Meaning of the Periodic Table: Periods
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