Скачать или смотреть Discuss the crystal Structure of NaCl. | Solid State | Physical Chemistry

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It has face-centred cubic (FCC) lattice. Na+ are present at the corners and face-centres while Cl- are present at body-centre and edge centres. It can also be vice-versa.

Every Na+ is surrounded by six Cl- ions, one above, one below, one on the left, one on the right, one in front and one at the back.

Similarly, every Cl- is surrounded by six Na+. We express it by saying that Na+ as well as Cl- have co-ordination number equal to 6. Co-Ordination number is the no. of atoms or ions immediately around a particular atom or ion. This structure has
co-ordination number 6 : 6.

If we look carefully at the structure of sodium chloride, we shall find that there are 4 units of Na+ and Cl- each in a unit cell. Sodium bromide (NaBr), sodium iodide (NaI), silver chloride (AgCl) and magnesium oxide (MgO) also possess sodium chloride (NaCl) type structure, i.e., FCC lattice.

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