Question

The coordination number of Y in XY type of crystal

Answer 1

Answer:

based on rock salt geometry, solid XY will have coordination number 6 for both X and Y.

Answer 2

The coordination number of Y in XY type of crystal is either eight,six or four.

Explanation:

• XY type of crystal structure is seen in sodium chloride,ceasium chloride and Zinc sulphide.

• Sodium chloride has a f.c.c structure and the coordination here is in the ratio $6:6$

• In ceasium chloride,the arrangement is b.c.c and the coordination is in the ratio  $8:8$

• Zinc sulphide have either sphalerite or wurtzite structure.

• Eventhough the structure of zinc sulphide in either cases are different,coordination is in the ratio $4:4$

• So if a crystal have XY type structure,the coordination number of Y can be six,eight or four.