At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
In Formation of Nacl Crystal Lattice, the enrgy changes is explained by Born-Haber Cycle. First, sublimation of Na requires energy, then energy is required for breaking the Chlorine molecule into chlorine atoms....Now, more energy is required to ionize the Na atoms. This energy is called Ionization energy. Now, when these electrons get added to chlorine, energy is released because they attain noble gas configuration. This energy is called Electron Gain enthalpy. Now, both Na and Cl ions are present. They come toghether and and release huge amounts of energy forming NaCl crystal lattice...
but why is the sublimaton fo Na takes place we are talking about lattice which is solid so when sublimation occurs the Na will be converted to gas.......isn't it? @tusharlovesphysics
Yes, chlorine molecule exists in gaseous state, so we first sublime Na to form a gas, then after ions get attracted to each other and so much of energy is released that a solid crystal lattice is formed...