I have provided the exact number of protons, neutrons, electrons, plus the nucleus and energy levels to assemble a Lithium atom
you can use this with 6th grade general science, 8th grade physical science, or high school chemistry
you can make more of an impact if you use heavy weight card stock and use whatever techniques you know to make the electrons stand out from the paper.
Directions and finished product appearance are included. You can make this more artistic by adding glitter, other embellishments for younger kids.