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Why hexagonal close packed has 6 atoms?

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## Related Questions

###### Asked in Chemistry, Atoms and Atomic Structure, Metal and Alloys

### Name three crystal arrangements of closely packed metal atoms?

Most metals and alloys crystallize in one of three very common
structures: body-centered cubic (bcc), Li is an example of bcc ,
hexagonal close packed (hcp) Au is an example of hcp, or cubic
close packed (ccp, also called face centered cubic, fcc) Ag is an
example of fcg. The yield strength of a "perfect" single crystal of
pure Al is ca. 10^6 psi.

###### Asked in Math and Arithmetic, Geometry

### What shape has 6 rectangular faces and 2 hexagonal faces?

A hexagonal prism has 6 rectangular faces and 2 hexagonal
faces. Since it has 8 faces in total, it is a type of irregular
octahedron, however it is correctly classified as a prismatic
uniform polyhedron to avoid ambiguity with the regular octahedron
with triangular faces. The hexagonal prism forms the basis of the
hexagonal prismatic honeycomb.