Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
KVPY2018ChemistryClassification of Elements and Periodicity in Properties

The ionic radii of Na + ,   F - ,   O 2 - ,   N 3 - follow the order

Options

  1. AO 2 - > F - > Na + > N 3 -
  2. BN 3 - > Na + > F - > O 2 -
  3. CN 3 - > O 2 - > F - > Na +
  4. DNa + > F - > O 2 - > N 3 -

Correct answer

C. N 3 - > O 2 - > F - > Na +

Step-by-step solution

The given species are isoelectronic (same number of electrons) to each other. In case of isoelectronic species, cation with greater positive charge will have a smaller radius because of the greater attraction of the electrons to nucleus. Anion with greater negative charge will have the largest radius. This is because the net repulsion of electrons will out weight the nuclear charge and the ion will expand in size. Thus, the order of ionic radii will be, N 3 - > O 2 - > F - > Na +

Practice Classification of Elements and Periodicity in Properties on Quantrex Academy →

More from Classification of Elements and Periodicity in Properties

Which of the following is an INCORRECT match? 2026Match List-I with List-II: List-I (Element-Atomic number) List-II (Position in periodic table) (a) Ra – 88 (i) 4^ th period, 13^ th group (b) Ga – 31 (ii) 6^ th period, 6^ th group 2026Which element from following has positive electron gain enthalpy? 2026Which of the following elements belongs to group 2 and sixth period of periodic table? 2026Identify the most electronegative element by the following. 2026Identify increasing order of acidity for following diprotic acids in aqueous solutions. 2026Identify the group of periodic table that contains element Astatine. 2026What happens to the size of atoms in p-block elements when we move from left to right in the same period? 2026 Full Classification of Elements and Periodicity in Properties list All KVPY PYQs