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500 BCE
The Alchemist
He laid down the foundation for the periodic table -
Period: 500 BCE to
Atomic modle timespan
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400 BCE
Democritus
Matter is composed of atoms separated by empty space through which the atoms move -
399 BCE
Plato
Atoms shapes were based on regular polygons -
1500
Solar System Model
Nicholas Copernicus drew this model to model the atoms -
Robert Boyle
He made the definition of a element and helped with precise measurements and experiments. -
Aone Lavoiser
Total mass=reactants -
John Dalton
He made a version of the atomic theory stating that all atoms were composed of combinations these atoms in defined ratio -
Billiard ball model
John Dalton made a model with wooden balls showing small atoms in a atom -
Amaden Avagodro
He stated that gasses of equal size contain the same number of molecules given that pressure and temperature are the same. -
Dmitri Mendeleev
created periodic table by atomic weight -
Marie and Pierre Curie
They discovered how to isolate radiation and figured out that some elements produce more than others -
JJ Thompson
He discovers the electron. -
Plum pudding model
The model was made by JJ Thompson and the model shows that the atom is a sphere of positive charge, and negatively charged electrons are in it to balance the total positive charge. -
Albert Einstein
Einstein calculated how fast a visible particle would travel in a given time. -
Robert Millikan
He figured out the value of an electron. -
Niels Bohr
He was the first one to discover that electrons travel in separate orbits. -
Henry G.J Mosely
He proved that every element can be identified by how many protons it has. -
Ernest Rutherford
He is known for his studies on radioactivity -
Electron Cloud Model
The Erwin Shrodinger model showed relative position of electron -
James Chadwich
He discoverd the neutron. -
Erwin Schrodinger
He figured out how to find a electrons position and quantinization of hydrogen atoms.