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(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.
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Alexander the Great died after a lifetime of success in conquering the known world. (note: 323 BC)
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In 356 (BC), Alexander the Great was born.
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(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.
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Joseph Proust stated that all compounds conatin elements of a fixed proportion, also known as his law of definite proportions.
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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.
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Becquerel discovered the property of radioactivity that some substances have while experimenting with Uranium.
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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.
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Planx discovered heat radiation (also known as Plank's law of black body radiation) which became the basis for the quantum theory.
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The first ever noble prize was awarded.
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The popular teddy bear was introduced.
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First silent movie created and calledTHE GREAT TRAIN ROBBERY.
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New York subway was first opened.
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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.
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The now famous Oreo Cookie was first introduced.
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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.
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Millikan calculated the mass of an electron (approximatley 1/1840 the mass of a hyrdogen atom).
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First Winter Olympic took place.
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Using evidence he conjectured that electrons move in a wave like fashion.
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Schrodinger developed a mathematical equation that describes the motion of electrons in atoms - which led to the theory of the electron cloud.
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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.
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U.S stock market crashed, sparking the Great Depression.
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Discovered that nuetrons existed in the nucleus with the protons and have a mass similar to protons.
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WW2 began.
