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Hola Brainlians!!!Explain the defects of Modern periodic table .Class - 10thChapter - Periodic classification of elements.No spam, Spam will be reported immediately and action will be taken. Don't be greedy for points.

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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.

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