WA02_CHE-121-mar14 - Written Assignment 2 Atomic Structure...

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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) Mass number = number of protons (atomic number) + number of neutrons A = Z + 28 Z=26 26+28 = 54 A = 54 2. Calculate the number of neutrons of 239 Pu. (3 points) (Reference: Chang 2.14) A – Z = number of neutrons A= 239; Z=94 239 – 94 = 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. Na b. 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. alkali metals: They are group one elements that react with water to form hydroxide ions. Examples are Lithium and Sodium. b. alkaline earth metals: They are group 2 elements that easily form ionic bonds due to additional electrons in their valance shells. Examples are Beryllium and Magnesium.
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