CHEM-121_Written Assignment 2 - Thomas Edison State College...

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Thomas Edison State College General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: FEB2015 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)
2 Calculate the number of neutrons of 239 Pu. (3 points)
3 Write the appropriate symbol for each of the following isotopes: (a) Z = 11, A = 23; (b) 28, A = 64 (6 points) (Reference: Chang 2.17) a 23 b) 11 Na 28 4 Define, with two examples, the following terms: (a) alkali metals, (b) alkaline earth metal, (c) halogens, and (d) noble gases . (8 points) Z = 64 Ni (Reference: Chang 2.22) a Alkali metals (1A): Lithium (Li); Sodium (Na) b Alkaline earth metal (2A): Magnesium (Mg); Calcium (Ca) c Halogen (7A): Fluorine (F); Chlorine (Cl) d Noble gases (8A): Helium (He); Neon (Ne) 5 Identify the following as elements or compounds: (a) NH 3 , (b) N 2 , (c) CO, (d) Co, and (e) He. (5 points)
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