Single Choice

The number of atoms present in a hexagonal close-packed unit cell is :

A$$4$$
B$$6$$
Correct Answer
C$$8$$
D$$12$$

Solution

The closest packing of spheres in two dimensions has hexagonal symmetry where every sphere has six nearest neighbours. Hexagonal close-packing corresponds to a ABAB stacking of such planes.

The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell.

Thus, option B is correct.

SIMILAR QUESTIONS

Solid State

The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is:

Solid State

Stacking (a pile) of square close packed layer gives rise to :

Solid State

A metallic crystal crystallizes into a lattice containing a sequence of layers $$ABABAB$$.... Any packing of spheres leaves out voids in the lattice. What percentage by volume of this lattice is empty space ?

Solid State

The unit cell present in ABAB, closest packing of atoms is :

Solid State

Hexagonal close packing is found in crystal lattice of:

Solid State

Potassium hexachloroplatinate (IV), $${K}_{2}[Pt{ Cl }_{ 6 }]$$ adopts anti-fluorite crystal structure. The correct information(s) about ideal $${K}_{2}[Pt{ Cl }_{ 6 }]$$ crystal is/are

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