olorless spheres = cation \"M\" \'N1\', Blue spheres-anion “X” How many net cati
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Question
olorless spheres = cation "M" 'N1', Blue spheres-anion “X” How many net cations are in the unit cell? How many net anions are in the unit cell? What is the empirical formula for fluorite? How are the cations arranged in the unit cell? or Questions 4 & 5, be brief and specific. The cations are ccp.". or e in halfof the tetrahedral holes. ", etc.) The cations are found in the center of Your answer should contain each f How are the anions arranged in the unit cell? What is the coordination number of the cation? What is the coordination number of the anion?Explanation / Answer
for a fluorite structure:
cations are arranged in cubic closed packing or face centred cubic closed packing and anions are at tetrahedral void form by cations.
No. of Cations = 6 * 1/2 (at face centre) + 8 * 1/8 (at corner of unit cell)
(1) No. of cations = 4
an fcc have 8 tetrahedral voids and anion is present at every tetrahedral void so
No. of Anions = 8 * 1
(2) No. of anions = 8
Empirical formula = M4X8
(3) Empirical formula = MX2
(4) Anions are present at tetrahedarl voids form by Cations . Each body diagonal contains two tetrahedral voids.
each cation is surrounded by 8 anions so
(5) Coordination no. of Cation = 8
each anion is surrounded by 4 cations so
(6) Coordination no. of anion = 4
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