1912 ⟶ Concept of Molecular Dipole
Peter Debye develops the concept of molecular dipole to desc...
Year
1912
1913
💧 Concept of Molecular Dipole
Peter Debye develops the concept of molecular dipole to describe asymmetric charge distribution in some molecules.⟶
Molecular DipolePolarityMolecular StructurePhysical ChemistryPeter DebyeChemical BondsEarly 20th Century Chemistry
Switzerland🔢 Atomic Number Concept Introduced
Henry Moseley, working from Van den Broek's earlier idea, introduces concept of atomic number to fix inadequacies of Mendeleev's periodic table, which had been based on atomic weight.⟶
Atomic NumberPeriodic TableHenry MoseleyAtomic PhysicsChemistryPeriodic LawEarly 20th Century Chemistry
United Kingdom⚛️ 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