Atomic Model
a very distorted model of a helium atom:

Helium Atom = Alpha particle + 2 electrons

If drawn to scale, and

Particles "randomly" found within their regions:
       electrons within atom
       protons and neutrons within nucleus
       quarks within nucleons

but probability of finding them,
       at any place, with any momentum, at any time
       represented by the green (for electrons) or brown (for nucleons) density