When gaseous ions condense together to form a crystal, the energy is ............. This energy is called ............ energy.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Process**: When gaseous ions come together to form a solid crystal, they undergo a process of condensation. This process involves the ions moving from a gaseous state to a more stable solid state.

2. **Energy Change**: During this condensation process, energy is released. This is because the formation of a solid from gaseous ions is an exothermic reaction, meaning that it releases energy to the surroundings.

3. **Definition of Lattice Energy**: The energy that is released when gaseous ions condense to form a crystal is specifically referred to as lattice energy. Lattice energy can be defined as the amount of energy released when one mole of an ionic solid is formed from its gaseous ions.

...