German Chemist Justus von Liebig’s Discovery of Element Compounds, British Chemist Smithson Tennant Understanding the Composition of Diamond (Carbon), Scottish Chemist Archibald Scott Couper and French Chemist Charles-Adolphe Wurtz Developing the Theory of Elemental Bonds, German Chemist Friedrich Kekule’s Similar Elemental Bond Theory, French Engineer Henri Becquerel Discovering Radioactivity, New Zealand Physicist Ernest Rutherford Leveraging Radioactivity to Study the Quantum World, Rutherford’s Study of Alpha Particles and Elements, English Physicist James Chadwick’s Discovery of Neutrinos, Italian Physicist Enrico Fermi’s Theory Devised While Playing Tennis, German Chemist Otto Hahn Proving Fermi Incorrect, Austrian-Swedish Physicist Lise Meitner’s Water Droplet Theory Leading to the Development of Nuclear Energy, Fermi Releasing the First Nuclear Chain Reaction, the Cyclotron and Synchrotron Particle Collider, American Physicist Edwin McMillan and American Physicist Philip Abelson Developing the First Human Created Element of Neptunium, the Development of Plutonium for Nuclear Weaponry, the Etymology of “Plutonium”, and the GSI Helmholtz Center For Heavy Ion Research Discovering New Elements