Question

Consider the following statements about crystalline solids:

Answer 1

Answer:

(iii) Ionic solids have formula units in the point of the crystal lattice

Explanation:

To further clarify, ionic solids exists as crystal lattice in which each ion is bonded by electrostatic attraction or force to multiple neighboring ions with same or opposite charge thereby balances the force holding them together.

Consider Sodium Chloride (Nacl) as an example, the positive charge of Na+ is bonded by electrostatic attraction to the negative charge of cl-

Answer 2

Answer:

Statements (iii) is false

Explanation:

Ionic solids do not have formula units in the points of the crystal lattice, instead, they have ions in the points of the lattice.

Consider the example of NaCl. Here Na⁺ is the cation while Cl⁻ is the anion, together they form a cubic unit cell by the electrostatic attraction between them. A crystal lattice defines the arrangement of atoms or molecules in a crystal, and the points on it represent the species which are responsible for the ordered arrangement. In the case of ionic solids, these species are ions, as they are responsible for electrostatic attraction or repulsion causing an ordered arrangement around it.