Welcome to the NCERT Solutions for Class 10 Science - Chapter Periodic Classification of Element. This page offers a step-by-step solution to the specific question from Exercise 4, Question 10: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.
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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Read MoreWelcome 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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