WA 02_CHE-121-jan18.txt - Name College ID Thomas Edison...

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Name: College ID: Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: Semester and year: 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) 1. Calculate the number of neutrons of 239Pu. (3 points) (Reference: Chang 2.14) 1. 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) 1. 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) 1. Identify the following as elements or compounds: (a) NH3, (b) N2, (c) CO, (d) Co, and (e) He. (5 points)
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1. Give the numbers of protons and electrons in each of the following: (a) Na+, (b) Ca2+, (c) Al3+, (d) I–, (e) O2–, (f) N3–, and (g) He. (14 points) 1. Write the molecular formula of glycine, an amino acid present in proteins.
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