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John Dalton
John Dalton discovered that common substances brake down into the same elements of the same proportion. This discovery means that all similar objects/substances are made of the same type of 'stuff' of the same size. This was important because it was the first representation of a atom. -
Dmitri Mendeleev
Dmitri Mendeleev most important discovery was actually a creation. He was the creator of the current periodic table. the periodic table is a list of all the elements and their atomic structure. This discovery was important because even today the periodic table is almost unchanged and provides us useful information about elements. -
J.J. Thomson
J.J. Thomson discovered the electron., A electron is a negatively charged particle in a atom. This discovery was important because it added onto John Dalton's model of the atom. -
Marie Curie
Marie Curie discovered the two elements, Radium and Polonium. These are two radioactive elements. This discovery is important because it opened a new field of science, radioactivity. -
Lord Ernest Rutherford
Rutherford discovered that atoms consisted largely of air. Atoms where not a solid ball like Dalton said but where made partially of air. This discovery was important because it completely changed the model of the atom and was no longer a solid ball. -
Niels Bohr
Bohr discovered that electrons rotated around a nucleus at a fixed location. This is similar to how planets rotate around the sun. This discovery was important because it added on to Rutherford's model and made it more accurate. -
