Root Admin smb Posted March 7, 2007 Root Admin Share Posted March 7, 2007 Chemistry Periodic Table Find chemical element facts at: http://www.chemicool.com Chemicool.com offers chemistry forum, tools and more. The Periodic Table, devised in 1869 by Dmitry I. Mendeleyev is a way of presenting all the elements so as to show their similarities and differences. The elements are arranged in increasing order of atomic number(Z) as you go from left to right across the table. The horizontal rows are called periods and the vertical rows, groups. A noble gas is found at the right hand side of each period. There is a progression from metals to non-metals across each period. Elements found in groups (e.g. alkali, halogens) have a similar electronic configuration. The number of electrons in outer shell is the same as the number of the group (e.g. lithium 2 0 Quote VicRolfe.com Itaas Mo! (Cheers!) Kahit Kailan, Kaibigan!! (Friends Forever!!) smb - Walang Katulad!!! (San Miguel Beer - There is nothing like it!!!) Link to comment Share on other sites More sharing options...
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