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Modern Periodic Table is based on atomic no. of elements. The significance of atomic no. was proved by the experiment of
  • a)
    discovery of X-rays by Roentgen
  • b)
    Mulliken's oil drop experiment
  • c)
    Bragg's work on X-ray diffraction
  • d)
    Moseley's work on X-ray spectra
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Modern Periodic Table is based on atomic no. of elements. The signific...
Moseley in 1912 measured the frequencies of X-rays emitted by a metal when bombarded with high speed electrons. He discovered that the square root of the frequency of the more prominent X-rays emitted by a metal was proportional to the atomic number and not the atomic weight of the atom of the metal. He thus concluded that atomic number was a more fundamental property of an element than its atomic weight. This forms tha basis of the modern periodic law.
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Modern Periodic Table is based on atomic no. of elements. The signific...


Explanation:

Moseley's work on X-ray spectra:
Moseley's work on X-ray spectra played a crucial role in proving the significance of atomic number in the modern periodic table.

Significance of Atomic Number:
- Moseley discovered that the elements emit X-rays with characteristic frequencies that are directly related to their atomic numbers.
- He observed that the square root of the frequency of the X-rays emitted by an element is directly proportional to its atomic number.

Proof of Atomic Number's significance:
- By arranging the elements in order of increasing atomic number rather than atomic mass, Moseley was able to fill in gaps in the periodic table and predict the properties of missing elements.
- This led to the modern periodic table where elements are arranged based on their atomic number.

Impact on the Modern Periodic Table:
- Moseley's work provided a solid experimental basis for the concept of atomic number as the fundamental organizing principle of the periodic table.
- It helped in resolving the anomalies in the periodic table and led to a more accurate representation of the relationships between elements.

Conclusion:
Moseley's work on X-ray spectra was a groundbreaking experiment that confirmed the significance of atomic number in determining the properties and organization of elements in the modern periodic table.
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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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Modern Periodic Table is based on atomic no. of elements. The significance of atomic no. was proved by the experiment ofa) discovery of X-rays by Roentgen b) Mulliken's oil drop experiment c) Bragg's work on X-ray diffraction d) Moseley's work on X-ray spectra Correct answer is option 'D'. Can you explain this answer?
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Modern Periodic Table is based on atomic no. of elements. The significance of atomic no. was proved by the experiment ofa) discovery of X-rays by Roentgen b) Mulliken's oil drop experiment c) Bragg's work on X-ray diffraction d) Moseley's work on X-ray spectra Correct 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 Modern Periodic Table is based on atomic no. of elements. The significance of atomic no. was proved by the experiment ofa) discovery of X-rays by Roentgen b) Mulliken's oil drop experiment c) Bragg's work on X-ray diffraction d) Moseley's work on X-ray spectra Correct 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 Modern Periodic Table is based on atomic no. of elements. The significance of atomic no. was proved by the experiment ofa) discovery of X-rays by Roentgen b) Mulliken's oil drop experiment c) Bragg's work on X-ray diffraction d) Moseley's work on X-ray spectra Correct answer is option 'D'. Can you explain this answer?.
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