An atom is made of mostly empty space. It is the smallest particle in matter. Atoms have three parts the electrons, neutrons and protons. This is a model of an atom.
Electrons:
Electrons go around the nucleus. They are far away from the nucleus. They have negative electrical charge. They never reach the nucleus. They go so fast that you can never exactly see them.
Neutrons:
They hang out in the nucleus with the protons. They have no electrical charge.
Protons:
They hang out with the neutrons in the nucleus. They have positive electrical charge.
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