factors of lattic enthalpy
Answers
This model emphasizes two main factors that contribute to the lattice energy of an ionic solid: the charge on the ions, and the radius, or size, of the ions. The effect of those factors is: as the charge of the ions increases, the lattice energy increases.
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Lattice energy depends on the charge and size of the ions. That is it is directly proportional to charge and inversely proportional to size of the ions.
That means if the size of the cation is more lattice energy is less. For ex., if we compare the lattice energy of Mg2+ and Na+, the size of Na+ is more than Mg2+ that means its lattice energy is less than that of Mg2+.
Similarly if we compare the charges, more the charge more will be the lattice energy. In the above example the charge of Mg is more than that of Na and its having more lattice enthalpy.
(if the anion and cation size are of comparable size, the size of cation influence the lattice energy.