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The theory Democritus had is that everything is composed of atoms, in which they cannot be divided futher, and were therfore indestructable and unlimited.
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He named oxygen and hydrogen and discovered oxygen's role in combustion.
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He created the Dalton Atomic Theory and theorized that an atom can not be created, destroyed nor divided and that atoms of different elements that are connected are called compounds.
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Dalton's theory states that atoms can not be created destroyed or divided, in correspondance to Dalton's beleifs.
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He created the Periodic Table of Elements after theorizing how to organize the known elements. His system enabled him to predict the discovery and placement of elements such as Germanium.
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He discovered the first evidence for isotopes of a stable element. J.J. Thomson also discovered the natural radioactivity of potassium and demonstrated that hydrogen had only a single electron per atom.
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He measured the charge on a single electron as well as wining the 1923 Nobel Prize for Physics.
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He created his namesake model of the atom and discovered the nucleus by the Gold Foil Experiment.
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He made many contributions to understanding atomic structure and quantum theory. He received the Nobel Prize in Physics in 1922. He also created his namesake model of the atom, in which he proposed that energy levels of electrons are discrete, and that the electrons revolve in stable orbits around the nucleus.
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He developed a number of results in the field of quantum theory, which created the basis of wave mechanics. He also created the quantum mechanical model for the atom.
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He came up with chemical concept of the atomic number. He theorized that the number of positive charges (protons) were equal to its atomic number.
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He won the 1935 Nobel Prize in physics for his discovery of the neutron in 1932. He also inspired the U.S. government to begin serious atomic bomb research efforts.
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It's a vacuum tube containing one or more electron guns meant to accelerate and deflect the electron beams onto the screen to create the images, which a fluorescent screen is used to view images.
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In this model, the atom is composed of electrons surrounded by a soup of positive charges to balance the electrons' negative charges
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The gold foil experiment showed that the plum pudding model of the atom was wrong. This was because sometimes the alpha particles awould bounce back when hitting the gold sheet, proving most of the atom was empty space. This eventually lead to the discovery of a nucleus.
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Ernest Rutherford's model, comprised of a nucleus of positively charged particles with electrons around it.
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States the atom is a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus.
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A way to describe the location of electrons when orbiting the nucleus. (Different from Bohr's model of the atom in refference to the electrons)
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A model of the atom by Erwin Schrödinger, allowing him to theorize the location of an electron.
