Question

co-ordination number of hexagonal close packed structure in 2 dimension is​

Answer 1

Explanation:

Each sphere is in contact with six of its neighbours and the two-dimensional coordination number is 6. The centres of these six spheres are at the corners of a regular hexagon hence this packing is called two-dimensional hexagonal close packing.

i hope it's help to u. ❤

Answer 2

Answer:

the coordination number of hcp structure is  12

Explanation:

Hexagonal close the packing is a packing structure in which the lattice layers are arranged in the form of ABAB, where is the  each letter signifies an individual lattice configuration and a collection of these lattices forms of a  closed packing structure.

In hexagonal the  close packing, the top and the bottom of  lattice are similar with the geometry of a hexagon. Atoms are placed on the vertices and in the centre of the hexagon. And the middle layer has a triangular geometry, where the atoms are placed on the vertices of the triangle.

Because of such a geometry, any atom in the given hexagonal close packing the structure would be surrounded by 4 atoms in the same lattice as that of the concerned atom, by 4 atoms in the lattice above the atom and by 4 atoms in the lattice below the atom.

That can be simplified by saying that any given atom in hexagonal close packing is attached to 4 + 4 + 4 = 12 atoms at any point in time. hence by definition, the coordination number of hcp is 12.

#SPJ3