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Atom - Wikipedia
Atom | Definition, Structure, History, Examples, Diagram, & Facts
What Is an Atom? Atom Definition - Science Notes and Projects
Atoms - What are they? What's inside them? - Explain that Stuff
原子 - 维基百科,自由的百科全书
Periodic Table - Ptable
What is an atom - NRC
Build an Atom - Atoms | Atomic Structure | Isotope Symbols - PhET ...
Atoms and molecules - BBC Bitesize
2.1: Atomic Theory and the Structure of Atoms