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Standard IX
Chemistry
Merits of Mendeleev's Periodic Table
Which two cri...
Question
Which two criteria did Mendeleev use to classify the elements in his table?
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Solution
(i) Increasing order of atomic mass
(ii) Similarities in chemical properties of elements, i.e., the formula of oxides and hydrides formed by elements.
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Q.
Which important property did Mendeleev use to classify the elements in his Periodic Table, and did he stick to that?
Q.
(a) Which two criteria did Mendeleev use to classify the elements in his periodic table?
(b) State Mendeleev's periodic law.
(c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?
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(ii) down a group?
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(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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