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460 - 370 BC
He developed the concept of the atom
his experiment was he took a seashell and kept on breaking it up

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discoverd in 1803
his discovery was that ell elements were made out of atoms

Experiments with gases that first became possible at the turn of the nineteenth century led John Dalton in 1803 to propose a modern theory of the atom based on the following assumptions. 1. Matter is made up of atoms that are indivisible and indestructible.

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Year of discover was 1911
he discovered the atomic nucleus

Rutherford's Gold Foil Experiment proved the existence of a small massive center to atoms, which would later be known as the nucleus of an atom. Ernest Rutherford, Hans Geiger and Ernest Marsden carried out their Gold Foil Experiment to observe the effect of alpha particles on matter.

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1856 - 1940
He discovered the electron

his experiment was to rub items together to gain a charge and attracted a negative charge

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1913
The atoms can only jump energy levels whole increments at a time

Stairs you can only go up whole stairs at a time like energy levels in an atom

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his year of discover was 1932
he discovered the neutron
James Chadwick was assigned the task of tracking down evidence of Rutherford's tightly bound "proton-electron pair" or neutron. In 1930 it was discovered that Beryllium, when bombarded by alpha particles, emitted a very energetic stream of radiation.