-
400 BCE
Democritus
development of atomic theory of the universe -
384 BCE
Aristotle
moved to athens and stayed at platos academy for 20 years -
8 BCE
The Alchemists
santiagos dream -
5 BCE
Plato
athens dominated sparta -
Lavoisier
he was an experimenter and revolutionized chemistry -
John Dalton
identified the nature of red-green color blindness -
Newton's Law of Octaves
they attempted to classify elements based on their weight. -
Mendeleev's Pd. Table
chemical properties of elements and their compounds -
Photoelectric Effect
when the emission of electrons with electromagnetic radiation hit a material. -
Discovery of Radioactivity
the atom wasnt indivisible or immutable -
Discovery of the electron
that all atoms have tiny negatively charged subtonic particles or electrons -
Plancks Quantum Theory of Light
radiates and absorbes energy -
Plum Pudding Model
negatively charged electrons with positively charged soup -
Rutherford's Gold Foil Experiment
small percentage of alpha particles were deflected -
Robert Millikan
oil drop experiment confirmed existence of the electron -
Mosleys Atomic Numbers
arranged the elements on the periodic table -
Bohr's Planetary Model
electrons travel to separate orbits around the nucleus. -
Albert Einstein
his theory of relativity -
Discovery of the proton
Resulted in nuclear reaction. -
Charge of the Electron
atoms gain electrons and became negatively charged -
Schrodinger Equation
wave equation that calculated levels of electrons in atoms -
Heisenberg Uncertainty Principle
the position of speed for a particle had perfect accuracy -
Discovery of the Neutron
changed the scientists view of the atom