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Introduced the idea that an atom is the basic building block for everything. -
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All matter was composed of invisible and indestructible atoms with distinct masses and properties -
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Introduced the idea that atoms could interact through forces of electricity and magnetism. -
Discovered canal rays(+charged particles) contributing to the understanding that atoms contain subatomic particles. -
Discovered the electron, proposed the “plum pudding/chocolate chip cookie” model where electrons are embedded in a positively charged sphere, introducing the concept of interval structure in atoms. -
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Discovered the nucleus, created the “nuclear” model with a dense positively charged core and electrons orbiting it. -
Used the oil drop experiment to discover the charge of a single electron. -
Proposed a model of the atom in which electrons orbit the nucleus in a planetary-like style. -
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Werner Heisenberg contributed to atomic theory by establishing the uncertainty principle, which specifies that a particle's location and momentum cannot be precisely determined, and formulating quantum mechanics in terms of matrices. -
Stated that electrons could not be pinpointed, but used equations to find an area where they would likely be. -
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The neutron was discovered as a result of James Chadwick's Atomic Theory. In it, he fired high-energy particles at a beryllium sheet. Other particles, including the atom's neutron, were discharged. -