Differentiate between the arrangement of elements in Mendeleev’s periodic table and Modern periodic table.
| Mendeleev’s Periodic Table | Modern Periodic Table |
|---|---|
| Elements were arranged according to the increased atomic masses. | Elements were arranged according to increased atomic numbers. |
| Position of isotopes was not justified in Mendeleev’s periodic table. | There was no problem in placing of isotopes. |
| Hydrogen resembles both with alkali metals and halogens, and therefore, position of hydrogen was not justified. | Hydrogen has been given a unique position due to its resemblance with alkalis and halogens. |