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- #Classification of elements and periodicity in properties
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The statement that is incorrect for the periodic classification of elements, is
the properties of elements are the periodic functions of their atomic numbers
metallic elements are more in number than non-metallic elements
the first ionisation energies of elements along a period do not vary in a regular
manner with increase in atomic number
for d-block elements, the d-subshells are filled monotonically with electrons along
the period
Answers (1)
As per Moseley’s law, the physical and chemical properties of the elements are periodic
functions of their respective Atomic numbers.
If we closely observe the periodic table, we shall find that complete s-block, d-block, f- block are metals and heavy p-block elements also possess metallic character.
Ionisation energy usually increase along a period but there are some exception to this such as Be and B, N and O. For transition elements, d-subshells are not filled monotonically along the period due to stable configuration of half-filled and fully filled d-orbitals in Chromium and Copper respectively.
Hence Option 4 is correct.
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