Question

lattice enthalpy is defined as the δh° associated with the separation of a solid crystal into its constituent ions. lattice enthalpies for four compounds are given in the table.

compound	lif	nacl	mgcl₂	srcl₂

which of the following statements about lattice enthalpy is consistent with the information in the table?
a. it increases with the increasing radii of the ions in the compound.
b. it increases with the decreasing radii of the ions in the compound.
c. it increases with the decreasing charge of the ions.
d. it increases with the decreasing electronegativity of the atoms.

Explanation:

Lattice enthalpy is related to the strength of the ionic bonds in a solid - crystal. The smaller the ionic radii of the ions in a compound, the closer the ions can get to each other, resulting in a stronger ionic bond and a higher lattice enthalpy. So, lattice enthalpy increases with the decreasing radii of the ions in the compound.

Answer:

B. It increases with the decreasing radii of the ions in the compound.