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Atomic structure is the structure that exists within atoms. At first thought to be random, it is now known to be highly organised.
A simplified way to imagine what atoms "look like inside" is to think of a totally-empty football stadium.
If you put a marble in the very centre, that is the nucleus of the atom, where all the mass exists.
If several ants run around and around the very outside of the stadium, and these ants weigh nothing at all, these are the electrons.
Most of the atom is, however, made up of space, and the space inside every atom is connected to the space inside other atoms, and to the space outside, and so on and so on, so that all the small spaces there are, both inside atoms and outside, including what we call "outer space", are actually part of one bigger space, all connected together!
Anne Evans
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