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This chapter deals with the flow of electrons and how they are able to pass through certain materials called conductors. The model of all atoms is now widely accepted as being one of a central nucleus surrounded by orbiting electrons. Just to get this into perspective, imagine you’re sitting in a room reading a book. If an atom were as big as the whole of the room, the nucleus would be about as big as a full stop in your book. Even though atoms are considered as infinitely small, this shows that there’s a vast amount of inner space for subatomic particles like electrons to move around in. 

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