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NEETChemistryClassification of Elements and Periodicity in Properties

What is the main reason for the different chemical behavior of the first member of a group compared to the subsequent members in the same group?

Options

  1. ATheir small size
  2. BTheir large charge/radius ratio
  3. CTheir high electronegativity
  4. DTheir large number of valence orbitals

Correct answer

D. Their large number of valence orbitals

Step-by-step solution

The reasons for the different chemical behaviour of the first member of a group of elements in the s- and p-blocks compared to that of the subsequent members in the same group is the anomalous behaviour is attributed to their small size, large charge/ radius ratio and high electronegativity of the elements.

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