AB is an ionic solid. The ionic radii of A^{+ | vedclass

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(D) The lattice energy $(U)$ of an ionic solid is defined as the energy released when gaseous ions combine to form one mole of the crystalline solid.A

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$\frac{1}{(r_c+r_a)}$

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(D) The lattice energy $(U)$ of an ionic solid is defined as the energy released when gaseous ions combine to form one mole of the crystalline solid.According to the Born-Landé equation,the lattice energy is inversely proportional to the inter-ionic distance $(r_0)$.For an ionic solid $AB$,the inter-ionic distance $r_0$ is the sum of the ionic radii of the cation $(r_c)$ and the anion $(r_a)$,i.e.,$r_0 = r_c + r_a$.Therefore,the lattice energy $U$ is proportional to $\frac{1}{(r_c+r_a)}$.

$AB$ is an ionic solid. The ionic radii of $A^{+}$ and $B^{-}$ are respectively $r_c$ and $r_a$. Lattice energy of $AB$ is proportional to :

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