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Unformatted text preview: Protons were studied using Canal Rays. Rutherford took alpha particles and found oxygen 15 plus a proton. Ernest Rutherford:’ Discovered the nucleus. “It was about as credible as if you had fired a fifteen inch artillery shell at a piece of paper and it came back and hit you.” Told him that a positive charge was concentrated towards a center. The gold foil experiment proved that there was a concentrated nucleus. James Chadwick: Discovered Nuetron. No charge 1.674927x10^-24g AMU is the Atomic Mass Unit 1AMU=1/12 mass of a carbon 12 atom. All atomic weights are related to the carbon 12 atom. #protons in an atom is called the atomic number or Z number Z = element #np= isotopes Sum of #n+#p=A# (mass#) Only few instances where we will worry about isotopes. Isotopes are all the same element just diff # of neutrons. Isotopes have different physical properties....
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This note was uploaded on 03/26/2008 for the course CHEM 101 taught by Professor Williamson during the Fall '08 term at Texas A&M.
- Fall '08