The amount of energy released during formation of one mole of ionic compound from its constituent ions is called _____.

Lattice Energy

The correct answer is option 3. Lattice Energy.

The amount of energy released during the formation of one mole of an ionic compound from its constituent ions is called Lattice Energy.

Lattice energy is the energy released when gaseous ions combine to form an ionic solid. It is a measure of the strength of the ionic bonds in the solid compound. Lattice energy is typically expressed in units of energy per mole (e.g., kJ/mol).