CBSE Class 12 science: Dimensions of Unit Cells Videos | Relation between Cell edge and radius of atoms

• give a relationship between nearest neighbour distance(d),radius of atom(r), edge  of unit cell(a), for fcc and BCC crystal
• what is the number of octahedral sites per sphere in a f.c.c. structure.
• Show that edge centered cube and body centered cube has 2 atoms.
• Calculate formulas if atom A forms ccp, B occupies ½ tetrahedral void & atom C occupies all octahedral void.
• Ferric oxide crystalises as hexagonal close packing array of oxide ion two out of every three one octaheddral holes is occupied by ferric ions.derive the formula of ferric oxide .
• How do we identify primitive and centered cell.
• Distinguish between Triclinic and monoclinic unit cell.
• Name all the primitive unit cell in which all 3 sides are different.
• Element crystallizes as BCC. How many atom will be present in the unit cell of the element.
• Aluminium crystallizes as FCC. Calculate number of atoms that wil be present in the unit cell.

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