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Boyle publishes Sceptical Chymist
Robert Boyle published the Sceptical Chymist which presented his hypothsis that matter consist of atoms and clusters of atoms in motion and every phenomenon was the collision of these particles in motion (http://en.wikipedia.org/wiki/The_Sceptical_Chymist) -
conservation of mass
Antoine Lavoisier created the law of conservation of mass which says that mass cannot be created or distoried. (http://en.wikipedia.org/wiki/History_of_chemistry) -
Dalton's Law
John Dalton creates "Daltons's Law" which states that the total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture. (http://en.wikipedia.org/wiki/Dalton%27s_Law) -
Hess's Law
Germain Hess created Hess's Law. This was an early statement of Law of conservation of energy. This said that energy changes in a chemical process depend on the states of the starting and product materials, not on the pathway taken between te two states. (http://en.wikipedia.org/wiki/Timeline_of_chemistry) -
Periodic table
Lothar Meyer drew up the first periodic table of chemical elements. (http://en.wikipedia.org/wiki/Lothar_Meyer) -
THE ELETRON
J. J. Thomson discovers the electron using the cathode ray tube. (http://en.wikipedia.org/wiki/Timeline_of_chemistry) -
Rutherford
Ernest Rutherford discovered the concept of radioactive half-life, which proved that radioactivity involved the transmutation of one chemical element to another (http://en.wikipedia.org/wiki/Ernest_Rutherford) -
JJ Thomson
discoverd evidence of isotopes by channelling a stream of ionized neon through a magnetic and an electric field and measuring its deflection.This suggested two different parabolas of deflection, and concluded that neon is composed of atoms of two different atomic masses. (http://en.wikipedia.org/wiki/J._J._Thomson) -
Bohr Model
Niels Bohr created the Bohr modle that depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus. (http://en.wikipedia.org/wiki/Bohr_model) -
Neptunium
Edwin McMillan and Philip H. Abelson found neptunium, the lightest and first synthesized transuranium element, which found in the products of uranium fission. (http://en.wikipedia.org/wiki/Timeline_of_chemistry)
