-
320
Aristotle
Discovered that matter is made of atoms, and that matter will always exist. -
400
Indivisible solid sphere model
Ancient Greeks thought that atoms were indivisible solid sphere like figures. -
460
Democritus
Democritus proposed that matter was composed of tiny indivisible particles. -
Antoine Lavoisier
Made the first version of the law of Conservation of Matter, named hydrogen and oxygen, made first periodic table, it had 33 elements. -
John Dalton
British teacher based his theory on others experimental data Billard Ball Model atom is a uniform, solid sphere. -
Michael Faraday
Michael Faraday contributed to the fields of electromagnetism and electrochemistry -
Henri Becquerel
Henri Becquerel helped discover radioactivity with Marie Curie and Pierre Curie -
Lisa Meitner
Lisa Meitner worked on radioactivity and nuclear physics -
Louis de Broglie
Developed the wave mechanics theory, which greatly improved our knowledge of the physical nature on the atomic scale. -
Pierre and Marie Curie
Known for thier work in the study of radioactivity, thier work led to their discovery of the elements radium and polonium. -
J. J. Thompson
Discovers that the atom was made of electrons scattered unevenly within an elastic sphere, surrounded by positive charge to balance. -
The Plum Pudding Model
The plum pudding model was a model of the atom that incorporated the recently discovered electron. -
Albert Einstein
Albert Einstein had theories that led to new ways of looking at time, space, matter, energy, and gravity. His work led to important advances such as the control of atomic energy, space exploration, and applications of light. -
The Electron cloud model
The electron-cloud effect is a phenomenon that occurs in particle accelerators and reduces the quality of the particle beam. -
Planetary Model
A.K.A. The Ruthorford Model, is a model of the atom devised -
Ernest Rutherford
Gold Foil experiment discovered the nucleus density, positive charge in the center of the atom. -
Niels Bohr
Bright Line Spectrum tried to explain presence of specific colors in hydrogens spectrum enery levels. Electrons can only exist in specific energy states. -
Ernest Shrodinger
He took the Bohr atom model one step further. he used mathematical equations to descrive the likelihood of finding an election in a certain position. (A.K.A.: The Quantum Mechanical Model of the Atom. -
James Chadwick
Discovered the neutron in 1932. He led the British team in the Manhattan Project, which supported the USA's World War 2 effort to build the worlds first nuclear bomb. -
Otto Hahn
Otto Hahn was a German chemist and pioneer in the fields of radioactivity and radiochemistry, who was the first to recognise the uranium atom. -
Max Planck
Max Planck originated the quantum theory -
Glenn T. Seaborg
involvement in the synthesis, discovery and investigation of ten transuranium elements
