Hi,
I'm learning about the different structures (ccp based and hcp based).
How do I know whether a molecule is ccp or hcp - what do I have to know in order to find this?
And also, e.g. the NaCl crystal structure
Na+ and Cl- ions have coordination numbers of 6 and therefore octahedral geometries.
And with CaF2, the coordination numbers are 8 and 4, and so have tetrahedral and cubic coordination.
How do I work the coordination numbers out and therefore, the geometry because all the crystal systems are different?