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Antoine Lavoisier
Antoine Lavoisier developed an experimentally based theory of the chemical reactivity of oxygen and coauthored the modern system for naming chemical substances. -
Joseph Proust
Joseph Proust created the law of definite proportions. This law states that the relative quantities of any given pure chemical compound’s constituent elements remain invariant, regardless of the compound’s source. -
John Dalton
John Dalton created the first Atomic Theory of Matter. -
Dmitri Mendeleev
Dmitri Mendeleev developed the periodic classification of the elements; it is arranged by increasing atomic weight. -
Henri Becquerel
Henri Becquerel discovered radioactivity by experimenting with uranium and other substances. -
Marie Curie
Marie Curie's work led to the discovery of polonium and radium, and she developed x-rays. -
Max Planck
Max Planck created quantum theory. -
Robert Millikan
Robert Millikan found great discoveries in the study of elementary electronic charge and the photoelectric effect. He performed experiments in order to find the charge of an electron. -
Ernest Rutherford
Ernest Rutherford was a key figure in the study of radioactivity and developed his own theory of atomic structure. His theory stated that most of an atom is made up of empty space. -
Henry Moseley
Henry Moseley proved that every element is uniquely determined by the number of protons it has. -
Niels Bohr
Niels Bohr proposed a model of the atom in which the electron was able to occupy only certain orbits around the nucleus. This atomic model was the first to use quantum theory. -
Louis de Broglie
Louis de Broglie discovered the wave nature of electrons and suggested that all matter have wave properties. -
Erwin Schrödinger
Erwin Schrödinger built upon the wave theory of matter. He created the Schrödinger equation, which explained the evolution of the wave function-a quantity that describes the wave properties of a particle. -
Werner Heisenberg
Werner Heisenberg discovered the uncertainty principle, which states that the position and the momentum of an object cannot both be known exactly. -
James Chadwick
Jame Chadwick is famously known for the discovery of neutrons.
