The statement that is not correct for periodic classification of elements is (a) The properties of elements are periodic function 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 ionization enthalpies of elements generally increase with increase in atomic number as we go along a period.

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Non metallic elements are lesser in number than metallic elements is incorrect
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option-b
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Science ( biology, chemistry )

Block 1 H, block 14 c, block 15 N,P ,block 16 O, s, se, block 17 F, cl,br, I .....
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Option C
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