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The first Five Models of the Atom
Transcript of The first Five Models of the Atom
Renaissance begins Chemistry separates itself from alchemy, which although provided a good foundation for the science, it had dubious beliefs and inentions. Science begins John Dalton tries to establish consistent weights for the elements then known. John Dalton Atomic Mass Law of Multiple Proportion Law of definite proportion The Solid Ball Model Taking after Democritus, Dalton thought that atoms were small, indivisible balls with specified weights JJ Thompson, a physist had some cool ideas. Plum Pudding JJ Thompson took the cathode tube and made cathode rays. The Cathode Tube He used them to find particles.
He moved the particles around with magnets.
He guessed that because he did that, the particles were negative. The Plum Pudding Model Ernest Rutherford shot alpha particles through gold foil. Gold Foil Experiments 98% went through, proving that matter is made up of largely open space. Protons Discovered Electron Cloud Model Electrons in random cloud around the nucleus of the atom Rutherford Returns... In all galaxies... Galaxies and solar systems form in a certain pattern. When an object has mass, such as a star, it gathers a dust cloud into a ring about it because of gravity. Like this, and then planets and asteroids form. Rutherford hypothesized that since planets go in orbits like this around stars, then so must electrons around atoms. Neils Bohrs goes quantum on us. Each atom The atom is at the center... Every atom has a certain number of electrons in each shell, determining it's properties. If you have 8 electrons in the outer shell,
you're safe because they don't react w/other elements (the noble gases)
Having 1 or 2 electrons in the outer shell means that the element is highly reactive, such as sodium or magnesium. Means that two or more chemicals can combine in several different ways. Means that when two+ chemicals combine, they combine in set compositions. Bibliography Works Cited
"Google Images." Google Images. N.p., n.d. Web. 09 Oct. 2012. <http://images.google.com/>.
Taylor, Robert. N.p.: n.p., n.d. N. pag. Print.