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| | Dmitri Mendeleev --Great Minds, Great Thinkers |
 | | He stated that the elements were arranged in a pattern which allowed him to predict the properties of elements yet to be discovered. |
 | | Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (e.g., Pt, Ir, Os) or which increase regularly (e.g., K, Rb, Cs). |
 | | The arrangement of the elements, or of groups of elements in the order of their atomic weights, corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, Ba, C, N, O, and Sn. |
| www.edinformatics.com /great_thinkers/mendeleev.htm (526 words) |
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