Question

1) Among the following each set of ions, which has greater ionic radius and why? a) Na + , Mg2+ ,Al3+ b) I - , Br- , Cl- c) O2- , Mg2+​

Answer 1

Explanation:

Note : For isoelectronic species, the ion having lower atomic number is greater in size as compared to others. a) Na + has greater ionic radius in comparison to magnesium and aluminum ions. Here the ions are isoelectronic. b) As we move down the group, ionic radius increases. So, iodide ion has greater ionic radius. c) Here ions are isoelectronic. So, oxide ion has greater ionic radius in comparison to magnesium ion.