Q27 of 181 Page 283

Why did Mendeleev leave some gaps in his periodic table ?

Mendeleev left some gaps in his periodic table because he wanted to make sure that the elements having similar properties came in the same groups.


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27

Why do we classify elements ?

 27

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

 27

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

 27

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.