Brainteaserfan Posted September 17, 2012 Share Posted September 17, 2012 How are the periods numbered? Link to comment Share on other sites More sharing options...
ACUV Posted September 18, 2012 Share Posted September 18, 2012 (edited) 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 September 18, 2012 by ACUV Link to comment Share on other sites More sharing options...
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