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Democritus (c. 460 – c. 370 BCE) was an Ancient Greek philosopher born in Abdera, Thrace, Greece. A pupil of Leucippus, he was an influential pre-Socratic philosopher who formulated an atomic theory for the universe. Image from: http://en.wikipedia.org/wiki/File:Democritus2.jpg
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Joseph Priestley was an 18th-century English theologian, Dissenting clergyman, natural philosopher, chemist, educator, and political theorist who published over 150 works. Image from: http://en.wikipedia.org/wiki/Joseph_Priestley
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He came up with the term molecule. Image from: http://en.wikipedia.org/wiki/Amedeo_Avogadro
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John Dalton was an English chemist, meteorologist and physicist. He is known for his work in the development of modern atomic theory, and his research into colour blindness. image from: http://the-history-of-the-atom.wikispaces.com/John+Dalton
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Joseph Louis Gay-Lussac was a French chemist and physicist. He is known mostly for two laws related to gases, and for his work on alcohol-water mixtures, which led to the degrees Gay-Lussac used to measure alcoholic beverages in many countries. Image from: http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/early-chemistry-and-gases/gay-lussac.aspx
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He discovered caesium and rubidium with Gustav Kirchhoff. Image from: http://en.wikipedia.org/wiki/Robert_Bunsen
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Alfred Bernhard Nobel was a Swedish chemist, engineer, innovator, and armaments manufacturer. He was the inventor of dynamite. Image from: http://en.wikipedia.org/wiki/Alfred_Nobel
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He created his own version of the period table of elements. He also used it to correct the properties of some already discovered elements and also to predict the properties of elements yet to be discovered. Image from: http://en.wikipedia.org/wiki/Dmitri_Mendeleev
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Johann Friedrich Wilhelm Adolf von Baeyer was a German chemist who synthesized indigo, and was the 1905 recipient of the Nobel Prize in Chemistry Image from: http://en.wikipedia.org/wiki/Adolf_von_Baeyer
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He also discovered the Fischer esterification. He developed the Fischer projection, a symbolic way of drawing asymmetric carbon atoms. Image from: http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1902/fischer-bio.html
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He discovered that some medals are radioactive. Image from: http://en.wikipedia.org/wiki/Henri_Becquerel
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He discovered the cathode r\ays were streams of small negatively charged particles called electrons. Image from: http://www.nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-bio.html
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They both discovered radium . Image from: http://www.google.com/imgres?imgurl=http://www.wired.com/images_blogs/thisdayintech/2009/12/pierre_and_marie_curie.jpg&imgrefurl=http://www.wired.com/thisdayintech/2009/12/1221curies-discover-radium/&h=589&w=660&sz=114&tbnid=g5l_FyeKLST3IM:&tbnh=99&tbnw=111&zoom=1&usg=__o6LLOAkETo6khG0b5bk_Bcenk-Y=&docid=eF1DRg6MFUgh3M&sa=X&ei=Pa1YUrqdNdDwiQKMlICoBQ&ved=0CEoQ9QEwBA
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He discovered tthe atom is mostly empty space.
image from: http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1908/rutherford-bio.html -
Albert Einstein was a German-born theoretical physicist who developed the general theory of relativity, one of the two pillars of modern physics. Image from: http://www.nobelprize.org/nobel_prizes/physics/laureates/1921/einstein-bio.html
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He hypothesized that electrons traveled in fixed orbits around the atom's nucleus. Image from: http://www.nobelprize.org/nobel_prizes/physics/laureates/1922/bohr-bio.html
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He won a noble prize in 1935 for his discovery of the neutron in 1932. He concluded that the nucleus contained positive protons and neutral neutrons. Image from: http://www.nobelprize.org/nobel_prizes/physics/laureates/1935/chadwick-bio.html
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Linus Carl Pauling was an American chemist, biochemist, peace activist, author, and educator. He was one of the most influential chemists in history and ranks among the most important scientists of the 20th century. Image from:http://en.wikipedia.org/wiki/Linus_Pauling
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Probability cloud is used in the study of sub atomic particles. It refers to the orbitals in which there is a probability of finding free electrons in an atom. It helps in considering electrons as one large mass and not individually. Image from: http://www4.nau.edu/microanalysis/Microprobe/Xray-ElectronShells.html
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Aristotle describes his idea of five elements of Matter. Image from: http://en.wikipedia.org/wiki/File:Aristotle_Bust_White_Background_Transparent.png
