QUE : HOW HSAB PRINCIPLE USEFUL IN EXPLAING STABILTY OF IONIC COMPOUNDS ?

ANS : By HSAB  principle- condition of forming stable bond
 small cation +small anion  or big cation + big anion
reason  : small cation stabilize the small anion better and big cation stabilize the big anion better and forms strong bond.
weak bond is formed when
small cation + big cation  or big cation + small anion