The statement which is not correct for periodic classification of elements is A)The properties of elements are a periodic function of their atomic numbers B)Non-metallic elements are less in number than metallic elements C)The first ionisation energies of elements along a period of vary in a regular manner with increase in atomic number D)Generally electronegativity and electron affinity increase across the period

Options

A. The properties of elements are a periodic function of their atomic numbers
B. Non-metallic elements are less in number than metallic elements
C. The first ionisation energies of elements along a period of vary in a regular manner with increase in atomic number
D. Generally electronegativity and electron affinity increase across the period

Answer

C