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The "creator" of the atom
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Aatoms of one element can't convert into another elrment. He also showed that molecules are made up of atoms in fixed proportions.
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He found that atoms contain positivley charged particals called protons and scenes atom contain negatively charged particals they must contain the positive particals to be electrically neutral.
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Determined the unit charge of the electron in 1909 with his Oil Drop Project.
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Described that the atom has a tiny dense core, which he called the Neucleus. Density meaning the neucleus has nearly all the mass. Around the neucleus is light negtive particales called electrons. These electons circulate around the core, like planets revolve around the sun.
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Stated that electons are in stable levels around the nucleus.
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Described the montion of electrons. His work lead to the electron cloud modle.The electron cloud is a probable location of where electrons can be found. He suggested that electrons behave in a wave-like manner rather than just as particales and that their exact location within an orbit could not be precisely calculated.
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Discovered that an atom was made up of positives and negatives. He discovered the electron.
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Discovered the neutron in 1932 which led directly to the discovery of the atomic bomb.
