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Question

For the periodic classification of elements, the incorrect statement is:

A
the properties of the elements are the periodic functions of their atomic numbers
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B
non-metallic elements are lesser in number than metallic elements
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C
the first ionization energies of elements along period do not vary in a regular manner with a increase in atomic number
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D
for transition elements, the d-subshells are filled with electrons monotonically with increase in atomic number.
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Solution

The correct option is C the properties of the elements are the periodic functions of their atomic numbers
Properties of elements are the periodic functions of their electronic configuration rather than atomic numbers for periodic classification.

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