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...turn are made up of smaller units called [[proton]]s, [[neutron]]s, and [[electron]]s. These latter particles are the subject of [[particle physics]], but th ...nd each element can be thought of as having a certain number of "[[valence electron]]s" (which, except for the first two atoms, is smaller than its actual numb

...and their positions and shapes can't be precisely defined, many of their [[electron shell]]s can at least be approximated as spherical.