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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties3 Marks
Question
  1. Name the group of the elements in which electrons are progressively filled in 4f-orbital and 5f orbitals.
  2. Which of the following is the correct order of size of the given species: I, I+, I-?
  3. Which of the following elements can show covalency greater than 4?

Be, P, S, B

✓

Answer

  1. In lanthanoids, 4f orbital is progressively filled.
  2. I- > I > I+, cations are smaller and anions are bigger than neutral atom. Cations have greater effective nuclear charge as protons are more than electrons anions have less effective nuclear charge as electrons are more than protons.
  3. 'P' and 'S' show co-valency greater than 4 due to presence of d-orbitals, in which electrons can be exited e.g. PCl5, SF6.

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