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timeline - Coggle Diagram

- - - - Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks
    - - Thomson
        
        thomson announced his discovery that atoms were made up of smaller components. This finding revolutionized the way scientists thought about the atom and had major ramifications for the field of physics. Though Thompson referred to them as "corpuscles," what he found is more commonly known today as the electron.
      - 1911
        
        Rutherford
        
        Ernest Rutherford is known for his pioneering studies of radioactivity and the atom. He discovered that there are two types of radiation, alpha and beta particles, coming from uranium. He found that the atom consists mostly of empty space, with its mass concentrated in a central positively charged nucleus.
        
        1926
        
        Schrodinger
        
        Assuming that matter (e.g., electrons) could be regarded as both particles and waves, in 1926 Erwin Schrödinger formulated a wave equation that accurately calculated the energy levels of electrons in atoms.