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The Solid State
Close Packing: Coordination Number
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Concepts tested
- Coordination number in hcp
All Questions
2001 AIPMT 1 question
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Zn converts from its melted state to its solid state; it has HCP structure, then find out number of nearest atoms : -In hexagonal close packing (hcp), each atom touches 6 atoms in its own layer, 3 atoms in the layer above and 3 atoms in the layer below.
Coordination number $= 6 + 3 + 3 = 12$
(Cubic close packing, ccp/fcc, also has coordination number 12.)
So each Zn atom has 12 nearest neighbours.