Question

- i) Explain the pauling method for the determination of ionic radius.
ii) What are iso electronic ions? Give examples
5 mark question​

Answer 1

Answer:

Explanation:

I) Pauling has calculated the radii of the ions on the basis of the observed internuclear distances in four crystals namely NaF,KCl,RbBr and Csl;this calculation named Pauling's method.In each ionic crystal the cations and anions are isoelectronic with inert gas configuration.

II) Isoelectronic ions are those which have a same number of electrons and hence same electronic configuration but the different magnitude of nuclear charge.

The K+ ion is isoelectronic with the Ca2+ ion. The carbon monoxide molecule (CO) is isoelectronic to nitrogen gas (N2) and NO+. CH2=C=O is isoelectronic to CH2=N=N. CH3COCH3 and CH3N=NCH3 are not isoelectronic. They have the same number of electrons, but different electron structures.