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

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

Non metallic elements are less in number than metallic elements

The first ionization enthalpies of elements generally increase across period

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

answer is C.

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Detailed Solution

order of filling is based on aufbaus prinicple

here it should be 3p,4s,3d….

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