Period (periodic table) - Wikipedia
Halogen | Elements, Examples, Properties, Uses, & Facts | Britannica
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Halogen Elements and Properties
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The periodic table. - ppt download
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Halogens on the Periodic Table | Most & Least Reactive Halogens - Video & Lesson Transcript | Study.com
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Halogens
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Halogens (examples, experiments, videos)
How to Read the Periodic Table | Groups & Periods | ChemTalk
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Main Groups in Modern Periodic Table, Alkali metals, Halogens & Inert gases groups | Science online
What are the Halogens in the Periodic Table? - Quora
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