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Chemistry Periodic Table

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How are the periods numbered?


Simply put from my time in early schooldays, teachers said they grouped elements together which had things in common. Technically, see the following,


IUPAC Periodic Table 1 Jun 2012 http://old.iupac.org...able-1Jun12.pdf


Group (Periodic Table) http://en.wikipedia.org/wiki/Group_(periodic table)



Edit : Unatainable link to a surf of Cyberspace.

Edited by ACUV
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