WA 02_CHE-121-Feb 16.docx - Name:Brandon Upton Thomas Edison State University General Chemistry I with Labs(CHE-121 Section no 2 Semester and year Feb

WA 02_CHE-121-Feb 16.docx - Name:Brandon Upton Thomas...

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Name:Brandon Upton Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: 2 Semester and year: Feb 2020 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) (Reference: Chang 2.13) 28 neutrons + 26 protons= 54 mass number 2. Calculate the number of neutrons of 239 Pu. (3 points) (Reference: Chang 2.14) 239- 94 protons= 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) (Reference: Chang 2.17) a) 23 11 NA b) 64 28 Ni 4. Define, with two examples, the following terms: (a) alkali metals, (b) alkaline earth metal, (c) halogens, and (d) noble gases . (8 points) (Reference: Chang 2.22) a) The group 1A elements (Li, Na) b) The group 2A elements (Be, Mg) c) Non metallic elements in group 7a (F, Cl) d) Non metallic elements in group 8a (He, Ne) 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)
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  • Spring '15
  • Khurana
  • Atom, Chemical element, Thomas Edison State University

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