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From the Contemporary Physics Education Project:
This is a good place to start: interactive, covers the basics of subatomic particles, kind of fun!
8th grade: extending understanding of atomic structure
Q & A format
Georgia State's HyperPhysics site
Pretty complex, especially at first, but discusses "visualizing electron orbitals."
Gets to the periodic table and specific elements, too.
Seems easier to understand later in the article than at the beginning.
8th grade Science: good basic information on quarks.