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Pd. 6 Democritus, Greek philosopher J.J. Thomson Democritus described atoms as being indestructible and completely full,containing no empty space. Cathode ray tubes are charged particles (which he called "corpuscles").
These corpuscles are residents of the atom.
These corpuscles are the only constituents of the atom. Creator of the CATHODE RAY,
the plum pudding model, and the quantum mechanical model JOHN DALTON It was in the early 1800s that John Dalton came up with his atomic theory. Dalton's atomic theory was that the atoms were tiny, indivisible, indestructible particles and that each one had a certain mass, size, and chemical behavior that was determined by what kind of element they were. Law of Conservation of Mass Citations www.nisk.k12.ny.us/faculty/hughes/Lavoisier3/index.htm http://dl.clackamas.cc.or.us/ch104-04/dalton's.htm http://www.aip.org/history/electron/jjelectr.htm www.engineeringtoolbox.com/conservation-mass-d_182.html The Law of Conservation of Mass states that
mass can neither be created nor destroyed Overview & Video Ernest Rutherford: creator of the gold foil experiment, The Rutherford model of the atom, and the electron cloud Gold Foil Experiment Lord Rutherford, sometimes called
"The father of nuclear physics", pioneered the orbital atom by using
the gold foil experiment http://chemistry.about.com/od/historyofchemistry/p/rutherford.htm All Pictures: http://www.google.com/imghp?hl=en&tab=wi www.universetoday.com/38326/plum-pudding-model/ The Plum Pudding Model Also called the chocolate chip cookie or the blueberry muffin. The Plum Muffin has been frequently been known to have a positively charged cloud around the positively charged most recent nucleus. http://dwb4.unl.edu/Chem/CHEM869B/CHEM869BLinks/www.chem.ualberta.ca/7Eplambeck/che/p101/p01022.htm Laws of the Atomic theory Each chemical element is made up of very small particles called atoms.
All of the atoms of a given element are identical. The atoms of one element are different from the atoms of any other element in some fundamental way.
Atoms combine with each other to form compounds. A given compound always has the same relative numbers of different types of atoms. Robert Millikan 1913, Measurement of the electron charge www-spof.gsfc.nasa.gov/stargaze/Ls7adisc.htm Using an atomizer into a region of electric forces,
Millikan measured the electron charge by spraying
little drops of oil. James Chadwick suite101.com/article/the-discovery-of-the-neutron-a46060 By 1932 Chadwick proved
the atomic theory was made with atomic particles, more than ten years before Rutherford. The Quantum Mechanical Model www.ausetute.com.au/atomichist.html sciencefactsandarticles.blogspot.com/.../science-facts-about-quantum-...
www.britannica.com/EBchecked/topic/.../Rutherford-atomic-model basically its a set of different principles that describe the physical realness of the matter at an atomic and subatomic level. The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun. The Rutherford model of the atom Erwin Schrodinger Created the Electron cloud model in the 1920's The Electron Cloud www.xtimeline.com/evt/view.aspx?id=335141 This was only model created by Schrodinger to show where the atoms could be, not where they are at any given moment. Niels Bohr atomictimeline.net/index.php Dmitri Mendeleev In 1869 Mendeleev
arranged 7 groups with similar properties
which were periodic functions of their own atomic weight Henry G. J. Moseley In 1914 using x-ray tubes, determined the charges on the nuclei of most atoms. Moseley wrote "The atomic number of an element is equal to the number of protons in the nucleus". As a conclusion!!! Questions This model made him believe that the electrons revolved around the nucleus like planets around the sun. Bohr's Planetary Model Review