Question

why smaller cation can stabilise a smaller anion while a larger cation can stabilise a larger anion?

Answer 1

But if the cation is small and anion is large or if cation is large and anion is small, we cannot have strong electrostatic force of attraction due to less overlap of the electron clouds of both. ... Due to form a stable lattice, larger cations stabilize large anions and smaller cations stabilize smaller anions.

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