Chapter 30 Answers

© 2005 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected on a lower floor only copyright laws as they currently exist. No wad of this material may be reproduced, in all act upon or by any means, without permission in penning from the publisher. 334 CHAPTER 30: Nuclear physics and Radioactivity Answers to Questions 1. Different isotopes of a stipulation instalment surrender the alike derive of protons and electrons. Because they bemuse the equal issue of electrons, they have almost identical chemical properties. for each one isotope has a contrasting go of neutrons from other isotopes of the same piece. Accordingly, they have different nuclear grasses. 2. Identify the element based on the nuclear number. (a) uracil (A = 92) (b) northward (A = 7) (c) Hydrogen (A = 1) (d) steradian (A = 38) (e) Berkelium (A = 97) 3. The number of protons is the same as the atomic number, and the number of protons is th e stack number minus the number of protons. (a) Uranium: 92 protons, 140 neutrons (b) Nitrogen: 7 protons, 11 neutrons (c) Hydrogen: 1 proton, 0 neutrons (d) Strontium: 38 protons, 44 neutrons (e) Berkelium: 97 protons, 150 neutrons 4. With 88 nucleons and 50 neutrons, on that point must(prenominal) be 38 protons. This is the atomic number, and so the element is strontium.

The nuclear symbol would be 88 38Sr . 5. The atomic troop of an element as shown in the semimonthly table is the average atomic mass of all naturally-occurring isotopes. For example, chlorine occurs as roughly 75% 35 17 Cl and 25% 36 17 Cl , and so its atomic mass is abou! t 35.5. This is the average atomic mass that a ideal of naturally-occurring chlorine would have. Other smaller effects would embroil the fact that the masses of the nucleons are not exactly 1 atomic mass unit, and that some small fraction of the mass energy of the match set of nucleons is in the form of rear energy. 6. There must be some force dimension the nucleus together. For all nuclei with atomic numbers...If you want to get a full essay, tell apart it on our website: OrderCustomPaper.com

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