Multiple choice

Which of the following orders of ionic size is/are incorrect?

  1. Se2- > Br- > Rb+ > Sr2+
  2. Te2- < I- < Cs+ < Ba2+
  3. Li+ > Na+ > K+ > Rb+

  1. Only 1

  2. Only 2

  3. 3 only

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All are isoelectronic species with the xenon electron configuration. Since all these ions have the same number of electrons, their sizes will depend on the nuclear charge. The Z values are 52 for Te2-, 53 for I-, 55 for Cs+ and 56 for Ba2+. Hence,  the correct order of ionic size is Te2- > I- > Cs+ > Ba2+.

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