Neutrons - Particles with no charge in the nucleus, Nucleus - Centre of the atom, contains neutrons and protons, Electrons - Negatively charged particles in shells, Bohr's discovery - Electrons are in shells around the nucleus at fixed points, Chadwick's discovery - Neutrons in the nucleus, Rutherford's discovery - Most of the atom is empty space, the nucleus is very small and heavy, 2.8.8.18 - Number of elements in the 1st 4 periods and the number of electrons that fit in the shell, Repel - When two like charges push apart from each other, Ion - A charged particle, Protons - Positively charged particles in the nucleus,

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