WA2_CHE-121-jun16 - Name College ID Thomas Edison State...

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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) Mass = Proton + Neutron = 26+28= 54 (Reference: Chang 2.13) 2. Calculate the number of neutrons of 239 Pu. (3 points) (Reference: Chang 2.14) Neutron = mass- Proton(Atomic number) + = 239-94=144 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) 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, outer layer of the electronic configuration has 1 electron, very reactive metal such as lithium, sodium (b) alkaline earth metal, outer layer of the electronic configuration has 2 electrons, easily to lose 2 electrons and form +2 charge, such as Magnesium, calcium.
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