a crystal formula AB3 has A ions at cube corner and B ions at the edge centre. The co ordination number of A and B respectively ?
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Answer:
6
Explanation:
No. Of A atoms at cube corner per unit cell = 8*1/8=1
No. Of B atoms at edge centre = 12*1/4 =3
Formula is AB3
And coordination no. is 6
B'coz Each A atom present at the centre is surrounded by 6 B atoms present at the edges it is connected to (2 in the plane, 2 above the plane and 2 below the plane). Thus the coordination number of A=6.
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