Write a semi-quantitative expression which describes the lattice energy of an ionic crystal. Define and explain all terms used, and explain how they may effect the properties of the crystal.

answers

watching

views

For unlimited access to Homework Help, a Homework+ subscription is required.

Join us on Discord

Chemistry Study Group

Join now

Related questions

In most instances in metal systems, we consider only the first or second near-neighbor interactions; however, in ionic crystals the lattice energy depends upon interactions among all the ions in the system. Consider a Na⁺ ion in the NaCl-structure which has

(a) 6 Cl ions at a distance of r; (b) 2d near-neighbors are 12 Na⁺ at Ã2r; (c) 3d n-n are 8 Cl^- at Ã3r; (d) 4^th n-n are 6 Na⁺ at 2r; (e) 5^th n-n are 24 Cl^- at Ã5r.

i) Write the first three terms for determining lattice energy; ii) the first four terms; iii) the first five terms. Compare with the value of the Madelung constant (1.7475). What is the significance of a negative value? What does the calculations tell you about binding in an ionic crystal?