Fill in the blanks. Lattice energy is associated with forming a crystalline lattice of alternating cations and anions from the ions. Because the cations are positively charged and the anions are negatively charged, there is a of potential - as described by Coulomb's law - when the ions come aqueous together to form a lattice. That energy is when the lattice forms.
As the ionic radii increase as you move a group, the ions cannot get as close to each decreases other and therefore as much energy when the lattice forms. Thus, the lattice energy positive (becomes less ) as the radius increases.

GASEOUS, LOWERING ,EMITTED AS HEAT, DOWN,DO NOT RELEASE,DECREASES,NEGATIVE.

Explanation: Filling the blanks gives

Lattice energy is associated with forming a crystalline lattice of alternating cations and anions from the _GASEOUS ions.

Because the cations are positively charged and the anions are negatively charged, there is a LOWERING of potential- as described by Coulomb's law-when the ions come together to form a lattice energy.That energy is EMITTED AS HEAT when the lattice forms.

As the ionic radii increases as you move DOWN a group, ions cannot get as close to each other and therefore DO NOT RELEASE as much energy when the lattice forms. Thus the lattice energy DECREASES (becomes less) NEGATIVE  as the radius increases.

The above gives the  definition of Lattice  Energy and how it relates to atomic and ion charge.

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