Q27 of 181 Page 283

In Mendeleev’s periodic table, why was there no mention of noble gases like helium, neon and argon?

Mendeleev did not mention noble gases in his periodic table because at that time noble gases were not invented, so there was no group of noble gases in Mendeleevs’s Periodic table.


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27

What were the two criteria used by Mendeleev to classify the elements in his periodic table ?

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Why did Mendeleev leave some gaps in his periodic table ?

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Would you place the two isotopes of chlorine, C1-35 and C1-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.

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State Mendeleev’s periodic law.