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13 Nov 2021

Given information

The lattice energy of rubidium iodide  

The lattice energy of potassium bromide  

Step-by-step explanation

Step 1.

The cation and anion in   are   and   respectively. Similarly, the cation and anion in   are   and   respectively.

Observe that both and belong to group of the periodic table. The size of the metal cations increases as one moves down the group. So the size of is greater than the size of .

Further, both   and   belong to group   of the periodic table. The size of the nonmetal anion increases as one moves down the group. So the size of is greater than the size of .

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