Which of the following statement is incorrect regarding the Mendeleev's periodic table?

It has made the study of elements easier and systematic.

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It has helped in correcting the doubtful atomic weights.

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It has paved the way for the discovery of new elements.

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Isotopes of the elements were placed at the same position in the periodic table.

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Solution

The correct option is D Isotopes of the elements were placed at the same position in the periodic table.
Mendeleev's periodic table:

made the study of elements easier and systematic because he was the one to arrange elements based on their atomic weights and propose the periodic law.

helped in correcting the doubtful atomic weights. We could accurately predict the properties like atomic weight and the predictions were more accurate than the actual measurements.

paved the way for the discovery of new elements because of the gaps proposed by Mendeleev, which he was sure would be filled later, as many elements were later discovered.

Isotopes were discovered long after Mendeleev developed the periodic table. So, there is no chance that he could place isotopes at the same position.

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Similar questions

(a) Name an element whose properties were predicted on the basis of its position in Mendeleev's periodic table.

(b) Name two elements whose atomic weights were corrected on the basis of their positions in Mendeleev's periodic table.

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. Select the correct alternative from the statements that are not related to Mendeleev's periodic table.

(a) The physical and chemical properties of elements are the periodic function of their atomic number.

(b) The elements with higher atomic weight were placed before elements with lower atomic weights.

(d) The atomic number has been established as the fundamental characteristic of elements based on the work on x-ray spectra of elements.

Q. Which of the following statement is correct in regard to the classification of elements?

(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

The following diagram showing part of the periodic table in which atomic radii of elements of third period are given. Which of the following elements has the lowest atomic radii?

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