What is latter ion in point 3 in this lesson ?

• Number of octahedral voids = Number of close-packed particles

Number of tetrahedral voids = 2 × Number of close-packed particles

• In ionic solids, the bigger ions (usually anions) form the close-packed structure and the smaller ions (usually cations) occupy the voids.

• If the later ion means smaller ion is small enough, then it occupies the tetrahedral void, and if bigger, then it occupies the octahedral void.

Spelling mistake is there in study material, it should be later ion which is representing smaller ion.

Hope now this clears to you!