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- johaan wolfgang dobereiner
- newlin
- madrid ivanovich mendeleev
- In 1829 Johann Wolfgang Dobereiner discovered the existence of families of elements with similar chemical properties. Because there always seemed to be three elements in these families, he called them triads. Each of the vertical columns in Table 7.1 represents one of these triads. But it was never used due to it only being applied to a few elements
- Henry Moseley
- In Newlands' table, the elements were ordered by the atomic weights that were known at the time and were numbered sequentially to show their order. Groups were shown going across the table, with periods going down – the opposite from the modern form of the periodic table.
- Mendeleev found that, when all the known chemical elements were arranged in order of increasing atomic weight, the resulting table displayed a recurring pattern, or periodicity, of properties within groups of elements. And it is similar to what we use not but not the one
- Henry Gwyn Jeffreys Moseley was an English physicist, whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number. This stemmed from his development of Moseley's law in X-ray spectra.
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