RooraSondazu Posted September 17, 2007 Share Posted September 17, 2007 I've got an assignment to do for chemistry, and it's the history of the periodic table, and I've got quite far on it, but I'm stuck on the similarities and differences. For similarities I have that they're separated into rows and columns, and are arranged by atomic weight, and for differences I have that the original table didnt have groups or periods, the lanthanoid and actinoid series werent there, and that the elements werent categorised so specifically. But now i'm stuck So I was just wondering if anyone could give me a hand with the similarites and differences, because I really can't think of any more . Thanks. Link to comment Share on other sites More sharing options...
YT2095 Posted September 17, 2007 Share Posted September 17, 2007 they split on a Macro level into metals and Non-metals for a start. group 1, are the Alkaline metals, group 2 are the alkaline Earth Metals (and give some pretty good colors in Pyrotechnics). then you have the D block (Transition Metals) quite a few give nice colors in certain oxidation states (they can have more than one). group 3 has a non metal but all the others there have quite low melting points. group 7 are the Halogens. and group 8 are the noble gases (sometimes called the Inert gases). that`s about as General a breakdown as it gets Link to comment Share on other sites More sharing options...
Mr Skeptic Posted September 17, 2007 Share Posted September 17, 2007 Plus, most of the heavier metals (above 92) weren't discovered until various degrees of recently. Link to comment Share on other sites More sharing options...
RooraSondazu Posted September 18, 2007 Author Share Posted September 18, 2007 Thanks for that, but it isn't what I asked for. Plus, most of the heavier metals (above 92) weren't discovered until various degrees of recently. Oh, Thanks Link to comment Share on other sites More sharing options...
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