The lattice energy of the BaS is lower
The quantity of energy released by the electrostatic attraction of oppositely charged ions is known as lattice energy (L.E). The ion's size and charge affect the lattice energy. lattice energy is inversely proportional to size of ion and directly proportional to charge of the ion Between CaS and BaS, group IIA has both Ca and Ba; Ca is present in the fourth period, while Ba is present in the sixth period. It is well known that the atomic size rises as we advance down a group; as a result, Ba is larger than Ca. Atomic size and lattice energy are inversely related; as atomic size increases, lattice energy drops. Therefore, because Ba is larger, the lattice energy of BaS will be lower.
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