[" 45: Periodic classification of elements based on atomic volume curve was given by (Single option correct) "],[qquad [" a nownd be lottringet "],[vdots" c owerentines "]]

The statement that is not correct for the periodic classification of elements is The properties of elements are periodic functions of their atomic numbers. Non-metallic elements are lesser in number than metallic elements. Electronegativity of the elements along the period from left to right increases in a regular manner. For transition elements the d-subshells are filled with the electrons monotonically with increase in atomic number.

Choice for the correct combination of elements from Column I and Column II are given as option (a), (b), (c), (d) out of which are correct.

When Mendeleev developed his periodic table, chemists knew nothing about the internal structure of atom. His classification was based on their atomic wetghts. Several anomalies persisted in the table with regard to the correct order of atomic weights of (i) K adn Ar (ii) Co and Ni (iii) Te and I