10-23-08[lecture15]jr

10-23-08[lecture15]jr - Chemistry 116: Lecture 15 10/23/08...

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Chemistry 116: Lecture 15 10/23/08 (JR) Nuclear Chemistry (Chapter 21) Chemical bonding and reactions are all about the electrons. Nuclear chemistry is what occurs in the nucleus Review: Isotopes are varying forms of the same element with the same number of protons and a different number of neutrons. Atomic number: Number of protons Mass Number: Number of protons + neutrons Some isotopes are stable, while others are radioactive. o Radioactive isotopes can go through different processes of decay. Protons determine the identity of an element (for example, hydrogen is the first element on the periodic table simply because all atoms of hydrogen have only one proton). If a decaying process creates a product with a different number of protons (atomic number), then the identity of the product element is different than the reactant. Conservation of mass does not apply in nuclear decays. However, conservation of mass number and atomic number DO apply (the atomic number and mass number cannot be created or destroyed—it is conserved).
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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10-23-08[lecture15]jr - Chemistry 116: Lecture 15 10/23/08...

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