(wait 5 sec. til atoms appear)

Element structures	Related 1:1 ionic structures
	atoms same position as half-scale Po; cations at same positions as Al atoms (fcc)
	atoms as in Fe(bcc); cations as in Po(cubic)
face centered cubic positions + 4 extra atoms halfway between corners and body center (only 4 of 8 such positions are occupied)	atoms as in Si (diamond); cations as in Al (fcc) cations as in Al (fcc); anions as in ZnS + 4 extra in Td holes

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Unit cell:	Atomic radii:	Hide or add atoms*

Al AuCaClCsCuFFeMgOPoSi S SrTiZn

* - Note: to hide or add atoms - you can select atoms by clicking on them after clicking the "Select atoms" button. It helps to first choose the "Show selection halos" option from the options menu within the Jmol popup menu. After selecting one or several atoms, you can either hide these atoms or show only these atoms. The "+ bonded atoms" adds one layer of atoms around whatever is already shown (however, successive clicking of this button will soon get you to the limits of space represented by these models).

Links: 

• An explanation of unit cells employing animated gifs