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He thought the wave-particle of the electron to develop and helped to solve a complex math equation that described the behavior of the electron in a hydrogen atom.
https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/05%3A_Electrons_in_Atoms/5.11%3A_Quantum_Mechanical_Atomic_Model#:~:text=In%201926%2C%20Austrian%20physicist%20Erwin,electron%20in%20a%20hydrogen%20atom.
https://www.youtube.com/watch?v=dH4clKNdTK8

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He concluded that electrons orbit the nucleus at fixed energy and difference, able to jump from one level to another.
https://www.youtube.com/watch?v=xazQRcSCRaY&t=228s

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The 2,400-year search for the atom - Theresa Doud

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Ernest Rutherford found that the atom is mostly empty space and that the mass of the atom is concentrated in a tiny central nucleus
https://www.britannica.com/biography/Ernest-Rutherford
https://www.youtube.com/watch?v=K3-c0o2Wp2o

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All atoms contain tiny negatively charged particles or
electrons.
https://www.youtube.com/watch?v=dehxVQAUqBs
https://www.nobelprize.org/prizes/physics/1906/thomson/biographical/

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He said that all matter is made of tiny indivisible particles called atoms, which he thought of as solid, massy, movable particles

https://www.britannica.com/video/153020/John-Dalton-development-atomic-theory