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Limitations of Mendeleev's Periodic Table

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Question

Choose the incorrect statement in view of Mendeleev's Periodic Table.

A

Isotopes of elements were placed at same position

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B

Position of hydrogen was clear

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C

Elements were arranged in order of their atomic masses

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D

Atomic masses were not strictly followed

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Solution

The correct option is B
Position of hydrogen was clear

Mendeleev did not explain the position of hydrogen in his periodic table.

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Similar questions

Q. Which of the following statement(s) about the Modern periodic table is/are incorrect?
(i) The elements in the Modern periodic table are arranged on the basis of their decreasing atomic number.
(ii) The elements in the Modern periodic table are arranged on the basis of their increasing atomic number
(iii) Isotopes are placed in an adjoining group(s) in the periodic table.

Q. (a) Why do we classify elements?
(b) What were the two criteria used by Mendeleev to classify the elements in 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 like helium, neon and argon?
(e) Would you place the two isotopes of chlorine, CI-35 and CI-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.

Q. The elements in the Mendeleev’s periodic table were arranged in the increasing order of their atomic masses. But, the sequence was inverted so that two elements with similar properties could be grouped together. Identify those two elements.

Q. Which group elements of modern periodic table were placed along with alkali metals in Mendeleev table?

According to Mendeleev’s Periodic Law, the elements were arranged in the periodic table in the order of increasing atomic numbers.

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