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Which of the following is not a merit of Mendeleev's periodic table?
  • a)
    It helped in correcting the atomic masses of some of the elements
  • b)
    He predicted the properties of some undiscovered elements and left gaps for them
  • c)
    He framed the periodic table with vertical and horizontal columns and gave shape to it
  • d)
    He gave separate places to isotopes in his periodic table
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is not a merit of Mendeleevs periodic table?a)I...
Mendeleev could not give separate places to isotopes which had different atomic weights in the periodic table
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Which of the following is not a merit of Mendeleevs periodic table?a)I...
Not a merit of Mendeleev's periodic table

Introduction:
Mendeleev's periodic table is considered one of the most significant achievements in the field of chemistry. It helped in organizing the elements in a systematic manner and paved the way for further research and discoveries. However, one of the merits of Mendeleev's periodic table is not correct. Let's discuss it in detail.

Explanation:
The following are the merits of Mendeleev's periodic table:

Helped in correcting the atomic masses of some of the elements:
Mendeleev arranged the elements in the increasing order of their atomic masses. In doing so, he noticed certain irregularities in the sequence of elements. He made some adjustments in the atomic masses of certain elements to place them in the correct group and period. This helped in correcting the atomic masses of some of the elements.

Predicted the properties of some undiscovered elements and left gaps for them:
Mendeleev's periodic table had gaps for the elements that were yet to be discovered. He predicted the properties of these undiscovered elements based on the properties of the elements in the same group and period. When these elements were discovered later, their properties were found to be similar to the predicted properties.

Framed the periodic table with vertical and horizontal columns and gave shape to it:
Mendeleev arranged the elements in horizontal rows called periods and vertical columns called groups. This arrangement helped in grouping the elements with similar properties together. This gave shape to the periodic table and made it easier for scientists to study and understand the properties of the elements.

Gave separate places to isotopes in his periodic table:
Isotopes are atoms of the same element with different numbers of neutrons. Mendeleev did not give separate places to isotopes in his periodic table as they were not discovered at that time. It was only later that isotopes were discovered and given separate places in the periodic table.

Conclusion:
Thus, it can be concluded that the correct answer is option 'D', as Mendeleev did not give separate places to isotopes in his periodic table. However, this cannot be considered as a merit of his periodic table as it was not intentional, and he did not have knowledge of isotopes at that time.
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Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

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Which of the following is not a merit of Mendeleevs periodic table?a)It helped in correcting the atomic masses of some of the elementsb)He predicted the properties of some undiscovered elements and left gaps for themc)He framed the periodic table with vertical and horizontal columns and gave shape to itd)He gave separate places to isotopes in his periodic tableCorrect answer is option 'D'. Can you explain this answer?
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Which of the following is not a merit of Mendeleevs periodic table?a)It helped in correcting the atomic masses of some of the elementsb)He predicted the properties of some undiscovered elements and left gaps for themc)He framed the periodic table with vertical and horizontal columns and gave shape to itd)He gave separate places to isotopes in his periodic tableCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following is not a merit of Mendeleevs periodic table?a)It helped in correcting the atomic masses of some of the elementsb)He predicted the properties of some undiscovered elements and left gaps for themc)He framed the periodic table with vertical and horizontal columns and gave shape to itd)He gave separate places to isotopes in his periodic tableCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is not a merit of Mendeleevs periodic table?a)It helped in correcting the atomic masses of some of the elementsb)He predicted the properties of some undiscovered elements and left gaps for themc)He framed the periodic table with vertical and horizontal columns and gave shape to itd)He gave separate places to isotopes in his periodic tableCorrect answer is option 'D'. Can you explain this answer?.
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