The statement that is not correct for the periodic classification of elements, is (a) the properties of elements are the periodic functions of their atomic numb

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check this too...option D is not correct

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Answer: (d) For transition elements the d-subshells are filled with electrons monotonically with increase in atomic number is the correct answer. Explanation: We'll check all options to get the correct answer. (a) The properties of elements are the periodic functions of their atomic numbers It is a correct statement. This statement was given by the scientist Mosley. He gave a form of modern periodic table which had atomic number as important. (b) Non-metallic elements are lesser in number than metallic elements This statement is correct. The number of metals are more than number of nonmetals. All the elements of s block f block and d block are metals. (c) The first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number This statement is also correct. The first ionization enthalpy is not constant along a period. It increases with the increase in atomoc number. For example, Nitrogen has ionization energy more than oxygen. (d) For transition elements the d-subshells are filled with electrons monotonically with increase in atomic number. This statement is incorrect. This trend is not true for elements like copper and Chromium. The d subshells aren't filled monotonically. There is a variation in the filling of orbitals. Hence, (d) For transition elements the d-subshells are filled with electrons monotonically with increase in atomic number is the correct answer

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