Question

why couldnot isotops be placed in mendleev periodic table​

Answer 1

Answer:

Because it was not possible to insert that isotopes . Moreover no specific reason is given but it may be due to his prediction.

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Answer 2

Answer:

Isotopes are the atoms of the same element having different atomic masses. Therefore, according to Mendeleev’s classification these should be placed at different places depending upon their atomic masses. For example, hydrogen isotopes with atomic masses 1,2 and 3 should be placed at three places. However, isotopes have not been given separate places in the periodic table because of their similar properties.

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