(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.
Alexander the Great 2
Alexander the Great died after a lifetime of success in conquering the known world. (note: 323 BC)
Alexander the Great
In 356 (BC), Alexander the Great was born.
Period: 370 to 460
(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 stated that all compounds conatin elements of a fixed proportion, also known as his law of definite proportions.
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.
Becquerel discovered the property of radioactivity that some substances have while experimenting with Uranium.
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.
Planx discovered heat radiation (also known as Plank's law of black body radiation) which became the basis for the quantum theory.
The first ever noble prize was awarded.
The popular teddy bear was introduced.
The Great Train Robery
First silent movie created and calledTHE GREAT TRAIN ROBBERY.
New York subway was first opened.
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.
The now famous Oreo Cookie was first introduced.
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.
Millikan calculated the mass of an electron (approximatley 1/1840 the mass of a hyrdogen atom).
First Winter Olympic took place.
Louis Victor de Brogile
Using evidence he conjectured that electrons move in a wave like fashion.
Schrodinger developed a mathematical equation that describes the motion of electrons in atoms - which led to the theory of the electron cloud.
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.
U.S stock market crashed, sparking the Great Depression.
Discovered that nuetrons existed in the nucleus with the protons and have a mass similar to protons.