CHE-121-Written Assignment 2.docx

CHE-121-Written Assignment 2.docx - Name Ashley Law College...

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Name: Ashley Law College ID: 0631739 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: June 2018 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) # of neutrons + # of protons = mass number 28+26= 54 (Reference: Chang 2.13) 2. Calculate the number of neutrons of 239 Pu. (3 points) 239-94= 145 (Reference: Chang 2.14) 3. Write the appropriate symbol for each of the following isotopes: (a) Z = 11, A = 23; (b) Z = 28, A = 64 (6 points) (a) ²³Na ¹¹ (b) Ni ⁶⁴ ² (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) Alkali metals are monovalent metals that are electropositive and is very reactive. Examples: Lithium and Sodium (b) Alkaline earth metals are bivalent strongly basic metals. Examples: Magnesium and Beryllium.
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  • Spring '15
  • Khurana
  • Chemistry, Atom, Chemical element, Thomas Edison State University, Edison State University

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