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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?
(d) How and why does the atomic size vary as you go:
(i) from left to right along a period?
(ii) down a group?
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(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?
ā(e) Would you place the two isotopes of chlorine, Cl-35 and Cl-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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