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The statement that is not correct for periodic classification of elements is
  • a)
    The properties of elements are a periodic function of their atomic numbers.
  • b)
    Non-metallic elements are less in number than metallic elements.
  • c)
    The first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number.
  • d)
    For transition elements, the d-subshells are filled with electrons monotomically with increase in atomic number.
Correct answer is option 'D'. Can you explain this answer?
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The statement that is not correct for periodic classification of eleme...

Explanation:

Transition Elements and d-Subshells:
In the periodic table, transition elements are the elements in groups 3-12. These elements have partially filled d-subshells in one of their common oxidation states. The d-subshells of transition elements are filled in a complex manner, not monotonically with increasing atomic number. This is due to the presence of inner electron shells that can shield the outer electrons from the increasing nuclear charge, leading to variations in ionization energies and electron affinities among transition elements.

Correct Answer - Option D:
The statement "For transition elements, the d-subshells are filled with electrons monotonically with increase in atomic number" is not correct. Transition elements do not follow a strict pattern of filling d-subshells with electrons as atomic number increases. The filling of d-orbitals in transition elements is influenced by electron-electron repulsions, nuclear charge, and other factors that lead to variations in electron configurations and properties across the transition series.

Therefore, it is important to understand that the filling of d-subshells in transition elements is not a simple, monotonic process and can exhibit complex variations in electron configurations and properties.
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The statement that is not correct for periodic classification of eleme...
In principle, electrons are added one at a time to the penultimate d-orbitals but due to extra stability of d5 and d10 configurations two electrons appear to have entered the d-shell due to shifting of one electron from ns to (n - 1)d orbital.
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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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The statement that is not correct for periodic classification of elements isa)The properties of elements are a periodic function of their atomic numbers.b)Non-metallic elements are less in number than metallic elements.c)The first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number.d)For transition elements, the d-subshells are filled with electrons monotomically with increase in atomic number.Correct answer is option 'D'. Can you explain this answer?
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