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10.8 Co-ordination number

In unit cells made by similar atoms, coordination number is defined as number of other atoms which are in contact with a specified atom.

Primitive Unit cell

The co-ordination number in simple cubic (Primitive) unit cell.


In body centred unit cell, the co-ordination number is 8, atom present at body centre touches all the corner atoms.

co-ordination number


Co-ordination number of any atom in fcc or ccp unit cell is 12

co-ordination number

HCP Co-ordination number of any atom in hcp is also 12

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