Scientists

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Clues

Proposed a standard method for determining atomic mass
Disproved Thomson's model when he observed alpha particles deflection pattern off of gold foil
Found that each element has a unique X-ray spectrum b/c of the positive charge on the nucleus
Developed 5 principles to explain the behavior of compounds observed during quantitative experiments
First person to say that matter is composed of atoms
Believed that matter was composed of the four elements: earth, air, water, and fire
Arranged the elements by increasing atomic mass and similar properties
Discovered electrons by studying the beams of electricity in cathode ray tubes