Lattice energy is directly proportional to
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lattice energy directly proportional to ionic charecter---
Lattice energy is the amount of energyreleased when one mole of the ionic solid is formed by the combination of constituent ions of the compound in gaseous state.For ex-latiice energy of sodim chloride corresponds to the energy released when 1mole of gaseous Na+ ions combine with 1mole of Cl- ions in gaseous state to form 1mole of NaCl solid.
This lattice energy can be given by modified by Coulomb’s law--
Lattice energy = k(Q1*Q2/r2)
where,
k = proportionality constant
Q1 and Q2 = charges on the ions
r = shortest distance betwee the cation and anion
This relation clears that lattice energy will be higher when charges are higher and they are at shortest distance from each other.
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