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John Dalton
He explained that each element is made of small atoms and that different elements have atoms of different mass. -
JJ Thomson
He suggested that an atom is a positively-charged sphere with electrons embedded in it. -
G.N. Lewis
He thought of atoms as constructed of a different series of cubes with electrons at each corner. -
Hantaro Nagaoka
He thought an atom had a large sphere in the center with a positive charge. -
Ernest Rutherford
He concluded that an atom is mostly empty space. -
Niels Bohr
He said electrons aren’t randomly located around the nucleus. -
James Chadwick
He discover the neutron, a particle having about the same mass as the proton but with no electrical mass.
