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Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
Asked by Abdul Last Modified
Answer 
Tasneem
| Mendeleev’s periodic table | Modern periodic table | ||
| 1. | Elements are arranged in the increasing order of their atomic masses. | 1. | Elements are arranged in the increasing order of their atomic numbers. |
| 2. | There are a total of 7 groups (columns) and 6 periods (rows). | 2. | There are a total of 18 groups (columns) and 7 periods (rows). |
| 3. | Elements having similar properties were placed directly under one another. | 3. | Elements having the same valence shell are present in the same period while elements having the same number of valence electrons are present in the same group. |
| 4. | The position of hydrogen could not be explained. | 4. | Hydrogen is placed above alkali metals. |
| 5. | No distinguishing positions for metals and non-metals. | 5. | Metals are present at the left hand side of the periodic table whereas non-metals are present at the right hand side. |
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