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John Dalton
atomic theory is a theory of the nature of matter, which states that matter is composed of discrete units called atoms, as opposed to the obsolete notion that matter could be divided into any arbitrarily small quantity -
j.j. thomson experiment
"plum pudding" model—the electrons were embedded in the positive charge like plums in a plum pudding (although in Thomson's model they were not stationary, but orbiting rapidly). -
Hantaro nagaoka
Eletrons move in orbits like the rings around saturn. -
Ernest Rutherford
Electrons move randomly in the space around the nucleus. -
Neils Bohr
the electrons movein spherical orbits at fixed distances from the nucleus. -
Werner Heisenberg & Erwin Schrodinger
an electron cloud is a visual model of the most likely locations for electrons in an atom. -
James Chadwick
Atomic nuclei contain neutrons and positivelycharged protons.
