CH 201 Lecture 03Bs

CH 201 Lecture 03Bs - CH 201 Tuesday, October 10 Elements,...

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CH 201 Tuesday, October 10 Elements, Isotopes, and our First Quiz
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Last Time Calculations and Rounding The factor-label method Intro to atomic anatomy electron neutron proton
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Cathode Ray Tubes Emit rays of high energy electrons tube glass tube anode stand alligator clip cathode
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Evidence for 3 Subatomic Particles Radioactivity Wilhelm Roentgen
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Elements Elements defined by number of protons in nucleus Examples: Any atom with 6 protons is a carbon atom Any atom with 3 protons is a lithium atom Number of neutrons, electrons is irrelevant This special number is called the atomic number Periodic table organized by atomic number
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All uranium atoms have 92 protons But some U atoms have 146 neutrons, others have 143 neutrons These have different masses, but they are both uranium They are called isotopes Isotopes are often referred to by their masses (protons + neutrons) For example U-235 and U-238 Or 235 U and 238
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CH 201 Lecture 03Bs - CH 201 Tuesday, October 10 Elements,...

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