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Oxygen
Joseph Priestley -
Atomic Theory
John Dalton -
Chemical Structure
August Kekule -
Atoms have Signatures of Light
Robert Bunsen and Gustav Kirchhoff -
Plastic
John Wesley Hyatt -
Periodic Table of Elements
Dmitri Mendeleev -
Fullerenes
Richard E. Smalley , Robert F. Curl , and Harold W. Kroto -
Radioactivity
Antoine Henri Becquerel -
The Electron
Joseph Thomson -
Electrons form Bonds
Gilbert N. Lewis