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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?
Most Upvoted Answer
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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Community Answer
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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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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