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Democritus Makes the First Atomic Discovery
(BC) Democritus was the first to discover the atom. He concluded that all atoms have a density proportionate to their volume. He believed that all nature functioned like a machine. He also made the conclusions that atoms are invisible, indestructible, and that they have varying sizes, shapes, masses, arrangements and positions. -
John Dalton Adds to Atomic Theory
John Dalton also made discoveries in 1805 and 1808. John Dalton showed that common atoms combine in constant proportions. He believed that elements must be made of smaller pieces of matter that have distinctive weights. He discovered atomic weight, and made the idea Democritus initially found useful. -
JJ Thompson Makes an Atomic Addition
JJ Thompson found that atoms aren’t simply just spheres. He was the first to discover electrons. He created the “plum pudding” model, which shows that electrons and protons are together in one combination in the center of the atom. -
Ernest Rutherford becomes part of the Atomic Theory
He also made discoveries in 1915 and 1918. Ernest Rutherford discovered that atoms were mostly made up of space. He created a more advanced model of the atom with that information. He found that atoms were made up of positivity found in the nucleus, and he also made the conclusion that atoms have negatively charged particles surrounding them. -
Neils Bohr Makes Additions to the Theory
Neils Bohr made the conclusions that electrons orbit around the nucleus in energy levels. He also made the discovery that electrons have a fixed energy according to their orbiting location. -
Louis de Brogile Makes Discovery
Louis de Brogile concluded that electrons have properties of both waves and particles. He also concluded that electron waves contained in the orbit around the nucleus set up a standing wave of frequency, certain energy, and wavelength. -
Erwin Schrodiner Makes an Atomic Discovery
Erwin Schrodinger discovered that it is only possible to describe the probability of where an electron would be, and that there is no definite answer as to where a certain electron is. This discovery ended up creating orbitals. -
Werner Heisenburg Discovers ATomic Information
Werner Heisenburg discovered that the only way to describe the location of an electron is through probability distribution. This later became the basis in modeling the electron cloud. He brought math into understanding the patterns of an atoms electrons
