Question

1>Which two chemically similar elements were separated in the Mendeleev’s periodic table?
2>Which dissimilar elements were grouped together in the Mendeleev’s periodic table?​

Answer 1

1>According to Mendeleev's Periodic Law, isotopes of an element must be given separate places in the periodic table because they have different atomic masses. It does not explain the electronic arrangement of elements. Elements that are chemically similar such as Gold and Platinum have been placed in separate groups.

2>These elements, called noble gases, were placed in the table as a separate group, called 0 group. The periodic table had to be modified thene

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