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	On a Larger Scale
	If we look at a solid material, we see that it is made up of a huge number of atoms that are so close to each other that they have started sharing some of their electrons. The shared electrons bind the atoms to each other to form a crystal structure also known as a crystal lattice.
	All solid materials around you, as for example the iron in your bicycle, are tightly interacting atomic structures just like the one Sally described.

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