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Even if elementary particles are considered to have zero size, when they form part of an atom, they sit in defined (quantised) energy levels.
To confuse matters - all elementary particles can be considered point particles - that is to say they are treated mathematically as having no extension in any dimension. That is not to say they are localised to a point - the Heisenburg uncertainty means that even a non-dimensional point particle fills a volume!
Theoretically it is possible for a particle to really take up no volume.
Loose-nukes - let's keep this mainstream -Cheers.