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FCCS SOLUTION PACK FINAL
CERTIFICATION TEST WITH ACCURATE
ANSWERS
⫸ Maximum coordination number in close packing Answer: 12


⫸ Two common close packing types Answer: HCP and CCP


⫸ HCP stacking sequence Answer: ABABAB


⫸ CCP stacking sequence Answer: ABCABC


⫸ HCP coordination number Answer: 12


⫸ CCP coordination number Answer: 12


⫸ HCP crystal system Answer: Hexagonal


⫸ CCP crystal system Answer: Isometric


⫸ CCP equivalent space lattice Answer: Face centered cubic


⫸ Number of octahedral sites per anion Answer: 1

, ⫸ Number of tetrahedral sites per anion Answer: 2


⫸ Octahedral site coordination number Answer: 6


⫸ Tetrahedral site coordination number Answer: 4


⫸ Octahedral sites in CCP Answer: Center and edges of unit cell


⫸ Tetrahedral sites in CCP Answer: Within cube away from faces


⫸ HCP ideal c to a ratio Answer: 1.633


⫸ Why HCP is less stable than CCP Answer: Face sharing octahedra
violate Paulings rule 3


⫸ Simple cubic packing coordination number Answer: 8


⫸ When simple cubic packing occurs Answer: Cation too large for
tetrahedral or octahedral sites


⫸ Simple cubic packing ratio Answer: Near 1 to 1 cation anion ratio


⫸ Isostructural minerals definition Answer: Same crystal structure
different composition

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