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

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The properties of elements are periodic function of their atomic numbers.

Non metallic elements are less in number than metallic elements

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

The first ionization enthalpies of elements generally increase across period

answer is C.

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Detailed Solution

order of filling is based on aufbaus prinicplehere it should be 3p,4s,3d….

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