A) the properties of the elements are the periodic function of their atomic number
B) non-metallic elements are lesser in number than metallic elements
C) the first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number
D) for transition elements the d subshells are filled with electrons monotonically with increase in atomic numbers
Correct Answer: D
Solution :
For transition elements, d-subshells are not filled with electrons monotonically (one at a time) because of extra stability of \[{{d}^{5}}\] and \[{{d}^{10}}\] configuration. Besides these, there are many other exceptions also, e.g., \[Nb,\,Mo,Ru,Rh,\,Pb,\], etc.
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