Week 2.docx - Written Assignment 2 Atomic Structure and...

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Written Assignment 2: Atomic Structure and Chemical Compounds Answer all assigned questions and problems, and show all work. 1. What is the mass number of an iron atom that has 28 neutrons? (3 points) Fe= 26+28 = 54 (Reference: Chang 2.13) 2. Calculate the number of neutrons of 239 Pu. (3 points) (Reference: Chang 2.14) 239 – 94 = 145 Neutrons 3. Write the appropriate symbol for each of the following isotopes: (a) Z = 11, A = 23; (b) Z = 28, A = 64 (6 points) A ) 23 Na 11 B) 64 Ni 28 (Reference: Chang 2.17) 4. Define, with two examples, the following terms: (a) alkali metals, (b) alkaline earth metal, (c) halogens, and (d) noble gases . (8 points) a) Li & Na b) Be & Mg c) F & Cl d) He & Ne (Reference: Chang 2.22) 5. Identify the following as elements or compounds: (a) NH 3 , (b) N 2 , (c) CO, (d) Co, and (e) He. (5 points) A) Compound B) Element C) Compound D) Compound E) Element 1 Copyright © 2017 by Thomas Edison State University . All rights reserved.
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6. Give the numbers of protons and electrons in each of the following: (a) Na + , (b) Ca 2+ , (c) Al 3+ , (d) I , (e) O 2– , (f) N 3– , and (g) He. (14 points) A) 11 protons & 11 electrons B)
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  • Spring '15
  • Khurana
  • Atom, Chemical element, Thomas Edison State University

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