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Question
Distinguish between:
Mendeleev’s periodic table - Modern periodic table
Solution
| Mendeleev’s periodic table | Modern periodic table | |
| 1. | Elements are arranged in increasing order of their atomic masses. | Elements are arranged in increasing order of their atomic numbers. |
| 2. | It is not divided into any blocks. | It is divided into four blocks, namely s-block, p-block, d-block and f-block. |
| 3. | There are 8 groups. | There are 18 groups. |
| 4. | Isotopes could not be placed properly. | Isotopes occupy the same position as the element. |
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