Write down five major differences between Mendeleev's. Periodic table and Modern Periodic Table.
Write down five major differences between Mendeleev's. Periodic table and Modern Periodic Table.
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| S. No. | Mendeleev's Period Table | Modern Periodic Table |
| (i) | Elements have been arranged in increasing order of atomic masses. | Element have been arranged in increasing order of their atomic number. |
| (ii) | It consists of 8 groups. | It consists of 18 groups. |
| (iii) | All the groups from I to VIII are divided into two sub-groups | No sub-groups. |
| (iv) | He left some gaps in the table for undiscovered elements | All elements are filled in increasing order of atomic number. No gaps Ieft in the periodic table. |
| (v) | Isotopes were placed in different groups. | Isotopes were placed ln same group. |
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