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Period (periodic table) - Wikipedia
Periodic table - Wikipedia
Common Groups and Periods of the Periodic Table
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Periodic Table
Elements of periodic table are arranged into groups/periods
Chem4Kids.com: Elements & Periodic Table: Periodic Table
periodic table - The periodic table | Britannica
a State the modern Periodic table law b How many periods and groups are there in the modern periodic...
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Elements in first, second, third and fourth periods — lesson. Science CBSE, Class 10.
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Excellent! Short and informative. What are Periods and Groups in the Periodic Table? | Chemistry | The Fus... | Science websites, Elementary science, Chemistry