Crystal Lattices and Unit Cells - Primitive and Centred Unit Cells

The distance between Na^– and Cl^– ions in NaCl with a density 2.165 g cm^–3 is __________.

Assertion: Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four.

Reason: Besides the body centre there is one octahedral void present at the centre of each of the six faces of the unit cell and each of which is shared between two adjacent unit cells.

Coordination numbers of Zn²⁺ and S^2– in the crystal structure of wurtzite are ____________.

Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?

A unit cell of BaCl₂ (fluorite structure) is made up of ____________.

Which primitive unit cell has unequal edge lengths (a ≠ b ≠ c) and all axial angles different from 90°?

Calculate the number of unit cells present in 1 g of gold which has a face-centered cubic lattice.

Orthorhombic crystal has the following unit cell dimensions ______.