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http://www.periodisk.s5.com/periodic.htm

» Det Interaktivte Periodiske System - Klikbar tabel med grundstoffernes navne, numre, atomvægte og elektronskaller.

» Nørskov Saack's Ordbog for Slægtsforskere - Med måleenheder, omregning, romertal og evighedskalender.

http://www.rundetaarn.dk/dansk/observatorium/periode.html

» Rundetaarn: Periodiske system - Grundstofferne, med egenskaber, ordnet efter atomnr. eller alfabetisk.

» www.formel.dk - Referenceoplysninger for matematik, fysik og kemi. Om formler, enheder, symboler og grundstoffer. Med debatforum og stikordsregister.

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