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.