Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.
Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.
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| Mendeleev’s periodic table | Modern periodic table. | |
| 1 | The elements were arranged according to increasing atomic masses. | The elements were arranged according to increasing atomic masses. |
| 2 | Position of isotopes was not justified. | There was no problem in the placing of isotopes. |
| 3 | Position of hydrogen was not justified because it resembles both with alkali metals and halogens. | Hydrogen has been given a unique position due to its resemblance with alkalis and halogens. |
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