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
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