WA 02_CHE-121-jul17.rtf

WA 02_CHE-121-jul17.rtf - Name Caleb McCully College ID...

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Name: Caleb McCully College ID: 0633459 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: Semester and year: September 2017 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) 26+28=54 (Reference: Chang 2.13) 2. Calculate the number of neutrons of 239 Pu. (3 points) (Reference: Chang 2.14) 93+x=239 x=146 3. Write the appropriate symbol for each of the following isotopes: (a) Z = 11, A = 23; (b) Z = 28, A = 64 (6 points) 34 11 Na ; 92 28 Ni (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) Alkali metals are in group 1 of the periodic table and include lithium and sodium. They tend to donate 1 electron. Alkaline earth metals are in group 2 of the periodic table and include magnesium and calcium. They tend to donate 2 electrons.
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