The statement that is not correct for periodic classification of element isA)The properties of elements are periodic function of their atomic numbers B)Non-metallic elements are less in number than metallic elements C)For transition elements, the 3d-orbitals are filled with electron after 3p-orbitals and before 4s-orbitals D)The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period

Options

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

Answer

D

Explanation

Clearly (a), (b) and (c ) are true (d) is not correct.