Discovery of Elements – Inert Gases
| Element | Discoverer |
|---|---|
| Argon | Sir William Ramsay and Lord Rayleigh |
| Neon | Sir William Ramsay and M.W. Tavers |
| Krypton | Sir William Ramsay and M.W. Tavers |
| Xenon | Sir William Ramsay and M.W. Tavers |
| Radon | Sir William Ramsay and R. Whytlaw-Gray |
| Helium | Sir William Ramsay, P.T.Cleve and N.Langlet |
Discovery of Elements – Radioactive Elements
| Element | Discoverer |
| Polonium | Marie Curie |
| Radium | Marie Curie and Pierre Curie |
| Actinium | Andre Louis Debierne |
| Thorium | Jons Jacob Berzelius |
| Uranium | Martin Heinrich Klaproth |
| Plutonium | Glenn T. Seaborg, Edwin McMillan, Joseph W. Kennedy, and Arthur Wahl |
Discovery of Elements – Chemical Elements
| Chemical Element | Discoverer |
| Barium | Humphry Davy |
| Calcium | Humphry Davy |
| Potassium | Humphry Davy |
| Magnesium | Humphry Davy |
| Boron | Humphry Davy |
| Sodium | Humphry Davy |
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