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Periodic Table Of The First 20 Elements
The Periodic Table is a Chart or Table showing the arrangement of Elements according to their Atomic Numbers. Periodic Table was first Designed by Dimitri Mendeleev in 1869. Mosely Designed the Modern Periodic Table. CONTENTS 1. Meaning of Periodic Table 2. History of Periodic Table 3. Matter, Atoms and Molecules 4. Shells, Groups and Periods 5 ...
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