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I thought they taught that it's an electron cloud? Its just drawn as orbitals as a visual aide, The "shell" moreso refers to their placement on the periodic table than anything actually important
The Quantum Mechanical model is not taught in High School sorrowfully :(( Thanks to the model electrons were no longer depicted as particles that were moving around the central nucleus in a fixed orbit basically.

I'm also posting the image:



It's a model based on quantum theory, which states that all matter has basically properties associated with a wave function, so an exact path of the electron is not defined in this model.
 
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