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The Electron Cloud Model is used to describe where electrons are when they go around the nucleus of an atom.

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The quantum mechanical model of the atom uses complex shapes of orbitals, volumes of space in which there is likely to be an electron.

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The Bohr 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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an atom is an empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths

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proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model. In Thomson's model, the atom is composed of electrons.

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all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.