1931 ⟶ Urey Discovers Deuterium
Harold Urey discovers deuterium by fractionally distilling l...
Year
1913
1931
1932
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💧 Urey Discovers Deuterium
Harold Urey discovers deuterium by fractionally distilling liquid hydrogen.⟶
IsotopesDeuteriumHeavy WaterUreyNuclear ChemistryFractional DistillationAtomic Physics20th Century Science
United States🧲 Chadwick Discovers the Neutron
James Chadwick discovers the neutron.⟶
Nuclear PhysicsNeutronChadwickAtomic StructureSubatomic ParticlesParticle PhysicsNuclear Reactions20th Century Physics
United Kingdom🌌 Jansky Discovers Sagittarius A
Karl Guthe Jansky discovers the first astronomical radio source, Sagittarius A⟶
Radio AstronomyJanskySagittarius AGalactic CenterAstronomyAstrophysicsCosmic Radio Sources20th Century Astronomy
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