Sun April 22, 2012 By: Satendra Pal

A solid XY has a rock salt geometry. what is the cordination number of X and Y? how many atoms of X & Y are present in the unit cell ?

Expert Reply
Mon April 23, 2012
In the rock salt ionic structure each sodium atom has six near neighbour chloride ions in an octahedral geometry and each chloride has similarly six near neighbour sodium ions in an octahedral geometry. 
So, based on rock salt geometry, solid XY will have coordination number 6 for both X and Y. 
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