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490
Democritus
atomic theory pt. 1- The theory that the universe is composed of 2 elements: the atom and the void. -
Antoin Lavoiser
French nobleman, burned phosphorus sulfer -
lavoiser- law of conservation of mass
he discovered it, it states that mass cannot be created or destroyed -
John Dalton Dalton atomic theory
a chemical reaction rearrangement of atoms -
John Dalton- atomic theory
all matter is made up of atoms, atoms are indestructible, compounds are formed by a combination of 2 or more atoms -
Dimitri Mendelow
Russian chemist/ invento, formulated periodic law created a far sighted version of the table of elements -
JJ Thomson- discovery of electron
concluded atoms are made of positive cored and negative charged particles called electrons -
JJ Thomson- Cathode Ray tube
high vacuum tube in which Cathode rays produce a luminous imagine. Used to discover electrons. -
Ernest Rutherford- Gold foil experiment
existence of a small massive center to atoms which would later be known as the nucleus -
JJ Thomson- Plum pudding experiment
electrons are surrounded by a soup of positive charges like negative plums are surrounded by positive pudding -
Ernest Rutherford
new zealand physicist, became known as the father of nuclear physics -
Ernest Rutherford- Rutherford model
rearranged his gold foil alpha models -
Henry Mosley
English physicist, known for atomic number -
Niels Bohr- atomic structure quantum theory
his theory could explain why atoms emitted light fixed wavelenghts -
Robert Millikan
American experimental Physicists, won noble physicists prize in 1923 -
James chadwick
English physicist, won Nobel prize in physics for discovering the neutron in 1932 -
Erwin Schrodringe- Bohr atom model
used math to describe likeliness of finding an electron in s certain spot -
Erwin Schodinger quantum mechanical model
how different shaped atoms move -
Erwin Schrodinger electron clouds
dense nucleus surrounded by a cloud of electorns