Q.

The statement that is not correct for periodic classification of elements is

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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 is C.

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Detailed Solution

In case of transition elements (or any elements), the order of filling of electrons in various orbital is 3p < 4s < 3d. Thus, 3d-orbital is filled when 4s orbital gets completely filled.
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