1.

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

Answer»

the properties of the elements are the periodic function of their atomic numbers
non-metallic elements are lesser in number than metallic elements
the first IONIZATION ENERGIES of elements along a period do not vary in a regular manner with increase in atomic number
for transition elements the d-sub-shells are filled with elements monotonically with increase in atomic numbers.

Solution :For transition elements, d-sub shells are not filled with electrons monotonically (one at a time) because of extra stability of `d^5` and `d^(10)` configurations. Besides these, there are MANY other exceptions, e.g. Nb, Mo, RU, RH, Pd etc.


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