Answer to Question #134873 in Inorganic Chemistry for NISAA

Question

A cubic solid is made of two elements P and Q. All P cations are located at the corners of the unit cell and six Q anions on the center of all the cubic faces.
i. Draw a structure of the cubic mentioned above.
ii. What is the coordination number of Q?
iii. What is the formula of the compound? Show your work.

Answer 1

( i )

Structure in which  P cations are located at the corners of the unit cell and six Q anions on the center of all the cubic faces.

( ii )

 coordination number of Q is " 12 " due to fcc arrangement .

( iii )

 formula of the compound is PQ₃ .

Explanation =

effective number of atoms of p = 1/8 * 8 = 1 ( due to all corners )

effective number of atoms of q = 1/2 * 6 = 3 ( due to all face center )