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John Dalton a brittish chemist concluded that every element is made up of atoms. he also thought that different elements have different atoms of different weights. Dalton pictured atoms as tiny solid balls
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As well as John Dalton the scientist J.J. Thomson was also a brittish scientist. Thomson discovered the electron. He proposed that the atom is a positivley charged sphere with electrons embeded in it, he compared it to a muffin with raisins embedded into it with the muffin being the atom and the raisins being the electrons
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Hantro Nagaoka a japanese physicist proposed that an atom is a large sphere in the center with a positive charge with the electrons revolving around it. just like planets around the sun.
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A Brittish physicist Ernest Ruthford concluded that the atom is mostly empty space. he also concluded that elctrons orbit randomly around the positivley charged Nucleus.
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a danish Physicist Niels Boher proposed a model that showed electrons orbiting on specific layers. he said that atoms absorb or give off energy when the electrons move,
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the present model conculdes that electrons are negativly charged cloud around the nucleus. it is immpossible to determine exactly where an electron is at any given time.
