Question

The statement that is not correct for periodic classification of elements in Modern periodic table is :

• A. The properties of elements are periodic function of their atomic numbers.
• B. Non-metallic elements are less in number than metallic elements.
• C. For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.
• D. The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.

Answer 1

Answer: (C)

For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.

Answer 2

For transition elements, the 3d-orbitals are filled with

electrons after 4s-orbitals and before 4p-orbitals.