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First one to suggest atoms exist and said they are indestructible and indivisible which led to others trying to prove him wrong and further discoveries
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Built the air pump with Robert Hooke to help his experiments for air combustion, animal breathing and transition of sound
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Came up with law of conservation; matter can’t be made nor destroyed
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He discovered that certain gases could only be combined in certain proportions, even if two different compounds shared the same common element or group of elements
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Arranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic functions of the their atomic weights". This became known as the Periodic Law
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Used a CRT to experimentally determine the charge to mass ratio of an electron
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Discovered the electron while experimenting with a cathode ray
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Created the quantum theory of energy which helped undertand atomic and subatomic processes
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Oil mass experiment determined the charge and the mass of an electron
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Used alpha particles as atomic bullets. Established that the nucleus was very dense, very small and positively charged
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Said the atom was a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
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Discovered relation between wavelengths and atomic number
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Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom
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Discovered the neutron