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Oxygen
Priestley called his discovery "dephlogisticated air" on the theory that it supported combustion so well because it had no phlogistion in it. -
Atomic Theory
Atomic theory established that all matter is made of tiny particles a discovery that led to amazing scientific breakthrough in areas from modern chemistry to nuclear energy. -
Atomic Combine into Molecules
Italian chemist Amedeo Alogadro finds that the atoms in elements combine to form molecules. -
Synthesis of Urea
it was synthesised in 1828 by Friedrich Wohler and was the first organic compound to be synthesised from inorganic. -
Chemical Structure
The arrangement of chemical bonds between atoms in a molecule specifically which atoms are chemically bonded to what other atoms with what kind of chemical bond. -
Atoms Have Signatures of Light
Gustav Kirchhoff and Robert Bunsen find that each element absorbs or emits light at specific wavelengths, producing specific spectra. -
Periodic Table of the Elements
in 1869 Russian chemist Dimitri Mendeleev started development of the periodic table of elements arranging chemical elements by atomic mass. -
Radioactivity
French physicist Antoine Henri Becquerel's experiments led to the discovery of radioactivity. He observed that the element uranium can blacken a photographic plate, even though separated from it by glass or black paper. -
Electricity Transforms Chemicals
Discoveries of several alkali and alkaline earth metals by Sir Humphry Davy proved that electricity transforms chemicals. Experiment with the use of electrical piles to separate salt that was performed at that time by him is today known as Electrolysis. -
The Electron
Thomson in 1897 was the first to suggest that one of the fundamental units was more than 1,000 times smaller than an atom, suggesting the subatomic particle now known as the electron. -
Plastics
The first synthetic polymer was invented in 1869 by John Wesley Hyatt, who was inspired by a New York firm’s offer of $10,000 for anyone who could provide a substitute for ivory. -
Electrons for Chemical Bonds
Niels Bohr publishes his model of atomic structure in which electrons travel in specific orbits around the nucleus, and the chemical properties of an element are largely determined by the number of electrons in its atoms. -
Fullerenes
The first fullerene was discovered in 1985 by Sir Harold W. Kroto,The Fullerene, also called buckminsterfullerene, any of a series of hollow carbon molecules.