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NaCl crystal structure can
be thought of in the following way:
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The chlorine anions (green) form a face
centered cubic close-packing structure
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The sodium cations (blue) fit into the
octahedral spaces formed by the chlorine.
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Note that there are 6 atoms (green) around
every hole (blue) but also 6 holes around every atom. So, the ration atoms :
holes = 1 : 1.
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the cube itself is highlighted by 8
interconnected small silver balls (inside the green atoms).
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