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The British chemist John Dalton discoverd that each element is made up of atoms. He also found that different elements have different masses.
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A little less than 100 years later another British scientist J.J. Thomson created a atom model. He created a new model, saying that an atom is a positively charge sphere that includes electrons inside.
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Physicist Hantaro Nagaoka is from Japan and created a model that showed the electrons revolving around the sphere that has the electric charge.
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The British physicist Ernest Ruthford stated that the atom is basically an empty space where electrons orbit around.
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A Danish Physicist Niels Bohr introduced a model that can show electrons moving in specific shells and layers rather than randomly moving around the atom.
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British physicist James Chadwick discoverd the neutron. This described why atoms were heavier than the mass of their protons and electrons..
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Electrons form a negatively charged cloud that is around the nucleus. It is impossible to tell where a electron is on a specif time.
