: (a) Why do we classify elements?
(b) What were the two criteria used by Mendeleev in creating his Periodic Table?
(c) Why did Mendeleev leave some gaps in his Periodic Table?
(d) In Mendeleev's Periodic Table, why was there no mention of Noble gases such as
Helium, Neon and Argon?
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Explanation:
(a)we needed to classify elements to make their studies easier and also to relate their similarities as it was noticed that the properties were periodic.
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