What does an atom look like? Throughout history scientists and philosophers have attempted to answer this question. As a result, they've come up with some useful models for understanding the building blocks of our universe.

Learn more about quantum physics: https://www.youtube.com/watch?v=uWMTOrux0LM

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Sources:
https://brilliant.org/wiki/bohrs-model/
http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/Bohr-model.html
http://www.chemguide.co.uk/atoms/properties/atomorbs.html
https://www.khanacademy.org/science/biology/chemistry--of-life/electron-shells-and-orbitals/a/the-periodic-table-electron-shells-and-orbitals-article
https://van.physics.illinois.edu/qa/listing.php?id=1289
http://padakshep.org/otp/subjects/chemistry/physical-chemistry/discovery-of-electrons-protons-and-neutrons/

Image Sources:
https://commons.wikimedia.org/wiki/File:Plum_pudding_model.svg
https://commons.wikimedia.org/wiki/File:Christmas_Pudding.JPG
https://commons.wikimedia.org/wiki/File:Ernest_Rutherford_LOC.jpg
https://commons.wikimedia.org/wiki/File:Atom_diagram.png
https://commons.wikimedia.org/wiki/File:Niels_Bohr.jpg
https://commons.wikimedia.org/wiki/File:James_Chadwick.jpg
https://commons.wikimedia.org/wiki/File:Helium_atom_QM.svg
https://commons.wikimedia.org/wiki/File:Electron_orbitals.svg