1.

The statement that is not correct for the periodic classification of element is :

Answer»

The properties of ELEMENTS are the periodic functions of their ATOMIC numbers
Non-metallic elements are lesser in NUMBER than metallic elements
The first IONISATION energies of elements along a period do not vary in a regular manner with increase in atomic number
For transition elements the d-subshells are filled with electrons MONOTONICALLY with increase in atomic number.

Solution :The d-sub shells are not filled with electrons monotonically with increase in atomic number.There are some exceptions like Cr, Cu etc.


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