Q.

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

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a

The properties of elements are the periodic functions of their atomic numbers.

b

For transition elements the ionisation energies increase gradually with increase in atomic number.

c

Non-metallic elements are less in number than metallic elements.

d

The first ionisation energies of elements along a period do not vary in a regular manner with an increase in atomic number.

answer is D.

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Detailed Solution

I.E depends on several factors like Size, nature of metal, electronic configuration etc.

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