KBr crystallizes in a cubic unit cell with Br^- ions on each corner and each face.How many K⁺ ions and Br^- ions are in each unit cell of KBr? A)1 K⁺ ion and 1 Br^- ion B)2 K⁺ ions and 2 Br^- ions C)4 K⁺ ions and 4 Br^- ions D)8 K⁺ ions and 8 Br^- ions

Question

Quizplus · Accepted Answer

In a cubic unit cell, corners contribute 1/8th of an atom each (since each corner atom is shared by 8 unit cells), and faces contribute 1/2 (since each face atom is shared by 2 unit cells). With 8 corners and 6 faces, the calculation for each type of ion is: (8 corners * 1/8) + (6 faces * 1/2) = 1 + 3 = 4. Therefore, there are 4 K+ ions and 4 Br- ions in each unit cell of KBr.

KBr Crystallizes in a Cubic Unit Cell with Br- Ions

KBr Crystallizes in a Cubic Unit Cell with Br^- Ions