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He discovered that all matter is made of invisible things called atoms. -
He named the elements carbon, hydrogen, and oxygen, and discovered oxygen’s role in helping us breath. He also discovered that water is made of hydrogen and oxygen. He also discovered sulfur, He confirmed that matter can not be created nor destroyed.
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Dalton discovered that the forces thought to cause pressure only worked between atoms of the same type -
Eugene Goldstein discovered protons.
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He discovered that all atoms contain have electrons. -
He discovered radioactivity.
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J.J. Thomson experimented with ray tubes and it revealed that all atoms contain tiny negatively charged particles.
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He discovered the relationship between energy and the radiation frequency.
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Robert Millikan discovered the magnitude of an electron's charge.
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He created a model of an atom where the electron was able to go into orbits around the nucleus. -
Rutherford created the theory that atoms have a nucleus with protons and neutrons in it. -
Ernest Rutherford discovered the proton by electrocuting hydrogen gas while using gold foil.
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He discovered that the electron was in a wave shape.
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He discovered the probabilistic characteristics of electrons.
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He made an equation that calculated the energy levels of electrons in atoms. E ( n ) = − 1 n 2 × 13.6 e V
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James Chadwick discovered neutrons by using the Rutherford gold foil experiment.
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James Chadwick showed that there was a neutral particle with the same mass as a proton.