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He was the first person to discover atoms. He smashed a seashell until he it turned into  fine powder. He called these tiny pieces atomos meaning indivisible.

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Joseph Priestley was the first to discover that air wasn't a elementary substance but a composition of gas and air was part of Aristotle's theory, which was the main theory at the time. The machine he used, an upgraded version of the Hales Apparatus, allowed him to study gases which was really hard to do at the time.

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1.He states that every single atom of an element is the same as every atom of the element
2.he used oxygen combined with either one or two volumes of nitric oxide to discover that Oxygen atoms are unique.

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JJ Thomson made his discovery of the electron in 1897 and this changed history! he used the cathode ray to discover the electron. the electron was the one out of the three primary types of the atom, the atom was made of Protons(positive) Electrons ( Negative) and Neutrons(Neutral). the electron brings a negative charge to a atom and to basically anything at all.

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In 1903 Marie Curie added to our understanding of atoms. She found 2 new elements(radium and polonium) formed with atoms. She isolated one decigram of almost pure radium chloride and had determined radium's atomic weight.

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Henry attempted to use high voltage to pull back into their radioactive source. Henry using atomic structure makes things more efficient.

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Neils Bohr discovered the electrons circle the nucleus of the atom in specific allowable paths called orbits. He added to the discovery of the atom by finding out how electrons move around in an atom.

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heisenbug discovered the uncertainty principle, meanin a particles position and momentum cannot both be known. the theory helped us understand the hydrogen atom