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Home » The statement that is not correct for periodic classification of elements is:(i) The properties of elements are periodic function of their atomic numbers.(ii) Non-metallic elements are less in number than metallic elements.(iii) For transition elements, the 3d-orbitals are filled with electrons after3p-orbitals and before 4s-orbitals.(iv) The first ionisation enthalpies of elements generally increase withincrease in atomic number as we go along a period.
The statement that is not correct for periodic classification of elements is:
(i) The properties of elements are periodic function of their atomic numbers.
(ii) Non-metallic elements are less in number than metallic elements.
(iii) For transition elements, the 3d-orbitals are filled with electrons after3p-orbitals and before 4s-orbitals.
(iv) The first ionisation enthalpies of elements generally increase withincrease in atomic number as we go along a period.
CBSE | Class 11 | Classification of Elements and Periodicity in Properties | NCERT Exemplar
The statement that is not correct for periodic classification of elements is:
(i) The properties of elements are periodic function of their atomic numbers.
(ii) Non-metallic elements are less in number than metallic elements.
(iii) For transition elements, the 3d-orbitals are filled with electrons after3p-orbitals and before 4s-orbitals.
(iv) The first ionisation enthalpies of elements generally increase withincrease in atomic number as we go along a period.

Option (iii) is the answer.

The Aufbau principle describes how electrons first fill low-energy orbitals (near to the nucleus) before moving on to higher-energy orbitals. They fill the orbitals singly as far as practicable when there is a choice between orbitals of equal energy (Hund’s rules).

 

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