Atomic Model
a very distorted model of a helium atom:

Helium Atom = Alpha particle + 2 electrons

If drawn to scale, and

    if protons & neutrons were a centimeter in diameter,
    then electrons and quarks smaller than the diameter of a hair,
    and atom diameter greater than length of 30 football fields!

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 or brown density to some details on atoms