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It is used to describe where electrons are when they go around the nucleus of an atom.

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This model of the atom uses complex shapes of orbitals, volumes of space in which there is likely electrons , based on probability rather than certainty.

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This model is a planetary model in which the negatively-charged electrons orbit a small, positively-charged nucleus similar to the planets orbiting the Sun.

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It shows that an atom is mostly empty space with electrons orbiting a fixed, positively charged nucleus in set, predictable paths.

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He discovered that atoms are composite objects, made of pieces with positive and negative charge and that negatively changed electrons within the atom were very small compared to the entire room.

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John Dalton proposed that all matter is composed of very small things which he called atoms.