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11 - History of the Atom

11 - History of the Atom - History of the Atom Nothing...

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Unformatted text preview: History of the Atom Nothing exists but atoms and empty space; Nothing everything else is opinion everything Democritus ~ 400 BC- suggested that all matter were 400 made up of smaller pieces called “atomos”. made An ATOM is the smallest part of an element An that still retains the properties of that element. element. 1 History of the Atom LaVoisier Father (1743-1794) of modern chemistry Established Law of Conservation of Mass Beheaded during French Revolution Marie-Anne: Translated and illustrated books http://www.ucl.ac.uk/sts/images/images_homepage/i-lavoisier.jpg 2 Dalton’s Atomic Theory (1) All matter is made of atoms. (1) Atoms are indivisible and indestructible. indestructible. http://www.kjemi.uio.no/software/dalton/graphics/john_dalton.gif 3 Dalton’s Atomic Theory (2) All atoms of a given (2) element are identical in mass and properties mass http://www.kjemi.uio.no/software/dalton/graphics/john_dalton.gif 4 Dalton’s Atomic Theory (3) Compounds are formed by (3) a combination of two or more different kinds of atoms. atoms. 5 Dalton’s Atomic Theory (4) A chemical reaction is a (4) rearrangement of atoms. rearrangement 6 Atomic Theory J.J. Thomson Cloud of positive charge Electrons 7 Atomic Theory Ernest Rutherford 8 Rutherford’s Nuclear Theory Rutherford’s of the atom Nucleus Nucleus Most contains: of the atom’s mass All the protons Volume Mostly of the atom: empty space Protons Are and electrons: equal in an electrically neutral atom 9 Evolution of the Atom Click Click here to view a video of the Atom song here Dalton J. J. Thomson Rutherford 10 10 Subatomic Particles Particle Symbol Charge Mass (g) Mass Mass Relative to Proton Proton 1/1835 Electron e- 1- 9.110 x 10-28 Proton p 1+ 1.672 x 10-24 1 Neutron n 0 1.675 x 10-24 1 11 11 Subatomic Particles Nucleus diameter is ~ 10-13 cm Atom is ~ 10-8 cm Forces are repulsive and attractive 12 12 Self Learning Self Click Click here to view a video on atomic here theory theory 13 ...
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