-
Period: 322 to
Aristotle
(note the timespan above represents Aristotle's lifespan and is 384-322 BC) Aristotle contradicted Deomocritus' beleifs about atoms and reasoned that things cannot be made of small indivisible particles. -
323
Alexander the Great 2
Alexander the Great died after a lifetime of success in conquering the known world. (note: 323 BC) -
356
Alexander the Great
In 356 (BC), Alexander the Great was born. -
Period: 370 to 460
Democritus
(note: the dates above represent the lifespan of Democritus and are 460-370 BC) Democritus reasoned that all things were made of miniscule, but indestuctible atoms (atomos). He also believed there were different types of atoms and they have mass. -
Joseph Proust
Joseph Proust stated that all compounds conatin elements of a fixed proportion, also known as his law of definite proportions. -
John Dalton
Dalton supported Democritus' veiws about atoms and created a four point atomic theory to support/express his opinion on the subject. Unlike Democritus, he utilized the scientific method in order to obtain his theory. -
Henry Becquerel
Becquerel discovered the property of radioactivity that some substances have while experimenting with Uranium. -
J.J Thompson
Discovered that electrons have a negative electron charge and created the plum pudding electron model where the electrons (plums) exist in a positive environment (the pudding). This theory is also known as the raisin bread theory. -
Max Planx
Planx discovered heat radiation (also known as Plank's law of black body radiation) which became the basis for the quantum theory. -
Noble Prize
The first ever noble prize was awarded. -
Teddy Bear
The popular teddy bear was introduced. -
The Great Train Robery
First silent movie created and calledTHE GREAT TRAIN ROBBERY. -
Subway
New York subway was first opened. -
Earnest Rutheford
Discovered the nucleus of atoms while sending a beam of alpha particles through a thin foil of gold and noticing that some beams rebounded of of the nuclei. This lead to the Rutheford Electrom Model. -
Oreos
The now famous Oreo Cookie was first introduced. -
Niels Bohr
Created an electron model where electrons orbit the nucleus in a way where they don't loose energy. This is known as the beginning of quantum mechanics. -
Robert Millikan
Millikan calculated the mass of an electron (approximatley 1/1840 the mass of a hyrdogen atom). -
Olympics
First Winter Olympic took place. -
Louis Victor de Brogile
Using evidence he conjectured that electrons move in a wave like fashion. -
Erwin Schrodinger
Schrodinger developed a mathematical equation that describes the motion of electrons in atoms - which led to the theory of the electron cloud. -
Werner Heisenberg
Created the Heisenberg uncertainty princple by stating that it is impossible to know exactly both the velocity and position of a (microscopic) particle at one time. -
Uh-Oh!
U.S stock market crashed, sparking the Great Depression. -
James Chadwick
Discovered that nuetrons existed in the nucleus with the protons and have a mass similar to protons. -
WW2
WW2 began.
