Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.
| Mendeleev’s periodic table |
Modern |
|---|---|
| 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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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 4 , Question 10: Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the ....
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