A) the properties of elements are periodic functions 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 electrons 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.
Correct Answer: C
Solution :
[c] In case of transition elements (or any elements), the order of filling of electrons in various orbitals is \[3p<4s<3d\]. Thus, 3d-orbital is filled when 4s orbital gets completely filled.
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