In THIS video, Mr. Hatfield demonstrates his cartoony, unrealistic way of drawing atoms, where '+' are protons, '0' are neutrons and 'e-' are electrons.
Every attempt to draw an atom is, in some sense, unrealistic: after all, atoms are smaller than the waves of visible light which our eyes use to form images. In a sense, atoms don't look like ANYTHING.
Yet, while unrealistic, mastering the use of these symbols can help students develop a better understanding of atomic structure, which can be applied to ions and isotopes as well as neutral atoms.
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