When we get several of these atoms together
we get crystals.

Notice that the sodium has a positive charge
and the sodium still has a negative charge,
this means that they will also have attractions
to the other atoms around them.  This will
cause them to form crystals in specific shapes.
These are actual salt crystals under
a microscope.  Notice how they all
have perfect 90 degree angles.  
Looking at the example above you
can see why this happens.
Ionic Bonds - The consiquences
Cute video on making salt
from sodium and chlorine gas.

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