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a
For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.
b
Non-metallic elements are less in number than metallic elements.
c
The properties of elements are periodic function of their atomic numbers.
d
The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.
answer is C.
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