1940 ⟶ Edwin McMillan and Philip H. Abelson Identify Neptunium
Edwin McMillan and Philip H. Abelson identify neptunium, the...
Year
1913
1939
1940
1941
⚛️ Concept of Isotopes Proposed
Frederick Soddy proposes the concept of isotopes, that elements with the same chemical properties may have differing atomic weights.⟶
IsotopesRadioactivityFrederick SoddyNuclear ChemistryAtomic PhysicsEarly 20th Century Chemistry
United Kingdom
🧪 Edwin McMillan and Philip H. Abelson Identify Neptunium
Edwin McMillan and Philip H. Abelson identify neptunium, the lightest and first synthesized transuranium element, found in the products of uranium fission. McMillan would found a lab at Berkeley that would be involved in the discovery of many new elements and isotopes.⟶
Nuclear ChemistryTransuranium ElementsNeptuniumEdwin McMillanPhilip H. AbelsonRadioactivityAtomic Physics1940s
United States⚛️ Glenn T. Seaborg Begins Work on New Atomic Nuclei
Glenn T. Seaborg takes over McMillan's work creating new atomic nuclei. Pioneers method of neutron capture and later through other nuclear reactions. Would become the principal or co-discoverer of nine new chemical elements, and dozens of new isotopes of existing elements.⟶
Nuclear ChemistryGlenn T. SeaborgTransuranium ElementsRadioactivityIsotopesAtomic PhysicsNeutron Capture1940s
United States