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john dalton
pictures atoms as tiny, indestructible particles, with no internal structure -
JJ thomson
british scientist, discovers the electron. later leads to his plum pudding model. he pictures electrons embedded in a sphere of positive electrical charge -
Hantaro Nagaoka
Japanese physicist, suggests that an atom has a central nucleus. electrons move in orbits like the rings around Saturn. -
Ernest rutherford
finds that an atom has a small, dense, positively charged nucleus. electrons move around the nucleus -
bohr's model
the electron moves in a circular orbit fixed distances from the nucleus -
Louis de Broglie
purposes that moving particles like electrons have some properties of waves -
Erwin Schrodinger
develops mathematical equations to describe the motion of electrons in atoms. his work leads to the electron cloud model -
james chadwick
confirms the existence of neutrons, which have no charge. atomic nuclei contain neutrons and positively charged protons