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-He proposed that all matter, including space and time, was made up of small units named atoms. He did not experiment and had little evidence to support this, but his idea was kept on by Lucretius.

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Agreed that all matter was created by atoms which he believed were indestructible. He also stated that compounds are created by combining two atoms and that all atoms of given elements are identical in their mass and properties.

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Discovered the electron. He experimented by testing and studying the nature of electric discharge in a high vacuum cathode-ray tube.

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Used the gold foil experiment to discover the modem model of an atom. He concluded that all positive charges were centralized, white negative electrons orbited the nucleus.

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A British physicist who demonstrated through experiments that the major properties of an element are determined by the atomic number, not by the atomic weight, and firmly established the relationship between atomic number and the charge of the atomic nucleus, it is positive.

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Explained that outer orbits in an atom could hold more electrons than the inner orbits By knowing this one can determine the atom's chemical properties. He also started the idea that electrons emit light by jumping orbits.

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he suggested that particles most likely have wave properties in addition to particle properties. a few years later the wave nature of electrons was detected through experiments. Objects of everyday experience, however, have a computed wavelength much smaller than that of electrons, so their wave properties have never been detected; familiar objects show only particle behavior.

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proposed that the quantum mechanical model of the atom, which treats electrons as matter waves. Electrons have an constant property called spin, and an electron can have one of two possible spin values: spin-up or spin-down. Any two electrons occupying the same orbital must have opposite spins.