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"The Sceptical Chymist"
Robert Boyle published this, making distinction from alchemy and chemistry. This also contained theory behind early ideas of the fundamentals of chemistry including atom, molecule and chemical reaction. -
Phosphorus is discovered
Discovered by German alchemist Hennig Brand -
Hydrogen Discovery
Henry Cavenish recognised properties of the element Hydrogen as a colorless, odourless gas that burns and is reactive with air. -
First element list
Antoine Lavoisier wrote a list of 33 elements, dfferentiating between metals and non-metals. -
Dalton's Law
John Dalton proposed "Dalton's Law", describing the relationship between different components in mixtures of gases. This helped future scientists to isolate gases and mixtures of gases in order for specific study. -
Atomic Weights & Element Symbols
Jakob Berzelius developed a table of atomic weights, also introducing symbols for elements. -
Element Grouping
Johann Dobereiner grouped elements together in 3 groups based on their properties. -
Early Periodic Table
Lothar Meyer organised a table of 28 elements organized by valence. -
Development of Periodic Table
Dmitri Mendeleev developed a table based on atomic weights, but arranged them periodically (columns) with elements sharing properties under eachother. This table included 66 elements. -
Noble Gases
William Ramsay discovered the Noble Gases. -
Electrons
Physicist J.J. Thompson discovered electrons, small negatively charged particles in an atom. -
Development in Electrons
John Townsend and Robert Millikan determined the exact mass and charge of electrons. -
Discovery of Radiation
Ernest Rutherford discovered that radioactivity was produced by decaying atoms. -
Atomic Structure
Ernest Rutherford and Hans Geiger discover that electrons orbit the nucleus of an atom. -
Redefining the Periodic Law
Henry Moseley determined the atomic number of every element, modifying the Periodic Law. -
Synthesized Elements
Edwin McMillan and Philip H. Abelson created neptunium for the first time, the lightest element found in uranium fission. -
Period: to
University of California
In this period of time, many elements were discovered at the University of California, Berkeley. These include Plutonium, Curium, Californium, Einsteinium and Fermium.