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democrius
democrius beleaved that all matter cinsisted of small particles. he called thse atoms. he thought they were different types of atoms with specific sets of porpeties. the atoms in liquid was round and smooth and the atoms in solids were rough and prickley. -
Dalton
Daltons theory was based on the premise that the atoms of different elemants could be distinguished by differences in their weights. -
J J thomson
he discovered the electron in a series of experiments designed to study nature of a electric charge. -
hantaro nagoaka
he bases his mdel of the atom around the rings of the planet saturn. however his model was not correct because it still allowed for the discorvery of the atms rings. -
ernest rutherford
He described the atoms as having a central positive nucleus surrounded by negative orbiting elecrons. it suggested most of the mass of the atom was contained in a small nucleus and the rest of the atom was space. -
Neils Bohr
He suggested that electrons travel around the nucleus in definite paths.these paths are always at a certain level away from the nuclous. he also started that electrons cannot travel in between each path but they can jump from one to another -
James chadwick
discovered the neutron and he hepled with the develope ment of the neclear model
