The correct answer is the lattice energy will decrease down the group.
Lattice energy of EBr is inversely proportional to the bond length of EBr means ( r+ + r- means sum of radius of cation and anion) since anion is fix. On going down the group cation radius increases so overall bond length of EBr increases down the group so by inversely proportional the lattice energy will decrease down the group.
What is bond length?
The distance between the nuclei of two groups or atoms that are connected to one another in chemistry is known as the bond length. Link length is the measurement of how long an atom-to-atom chemical bond is. Atomic bonds differ depending on the type of molecule they are present in.
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