Sodium oxide (Na2O) crystallizes in a structure in which the O2 - ions are in a face - centered cubic lattice and the Na + ions are in tetrahedral holes. What is the number of Na + ions in the unit cell?

A) 2

B) 4

C) 6

D) 8

E) none of these

Question

Oswaldo Johns

Chemistry

20 October, 16:08

Sodium oxide (Na2O) crystallizes in a structure in which the O2 - ions are in a face - centered cubic lattice and the Na + ions are in tetrahedral holes. What is the number of Na + ions in the unit cell?

A) 2

B) 4

C) 6

D) 8

E) none of these

+1

Answers (1)

Know the Answer?

Averie Bell · Answer 1

We have to know the number of Na⁺ ions in the unit cell.

The number of Na⁺ ions in the unit cell is (D) 8.

Sodium oxide (Na2O) crystallizes in a structure in which the O2 - ions are in a face - centered cubic lattice and the Na + ions are in tetrahedral holes.

O²⁻ ions are in a face centred cubic lattice, so the number of O²⁻ ions per unit cell is equal to 4. The number of tetrahedral hole = 2 X 4=8. Na + ions are present in tetrahedral holes, which indicates there are 8 number of Na + ions in the unit cell.

Sodium oxide (Na2O) crystallizes in a structure in which the O2 - ions are in a face - centered cubic lattice and the Na + ions are in tetrahedral holes. What is the number of Na + ions in the unit cell?A) 2B) 4C) 6D) 8E) none of these

Sodium oxide (Na2O) crystallizes in a structure in which the O2 - ions are in a face - centered cubic lattice and the Na + ions are in tetrahedral holes. What is the number of Na + ions in the unit cell?

A) 2

B) 4

C) 6

D) 8

E) none of these