Q4 of 49 Page 119

Why did Mendeleev left some gaps in his periodic table?

Mendeleev left some gaps in his periodic table because he predicted the existence of some elements which had not been discovered at that time.


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What is Newlands' law of octaves? Why is it called so?

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On what basis Mendeleev classify the elements?

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Why was the position of hydrogen not fixed in Mendeleev's periodic table?

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How many groups and periods are present in the modem periodic table?