# Tag Info

Notice that the text says nothing explicit about ion pairs. IE + EA relate to free gaseous unbound ions. Like: $$\ce{M(g) -> M+(g) + e-(g)}\tag{IE}$$ resp. $$\ce{X(g) + e-(g) -> X-(g)}\tag{EA}$$ The lattice energy (LE) is the energy released by forming solid ionic compounds from free ions: $$\ce{ M+(g) + X-(g) -> MX(s)}\tag{LE}$$ Gaseous ion pairs ...
The elements in the third period of the periodic table has following electron configurations and they achieve their most stable ionic forms by gaining or losing indicated electrons (final electron configurations of each is also shown): $\ce{Na}$: $\mathrm{[Ne]3s^1} \quad \ce{ ->[-e^-] Na+}: \mathrm{[Ne]}$ $\ce{Mg}$: \$\mathrm{[Ne]3s^2} \quad \ce{ ->[-...