WA2_CHE-121-jun16 - Name College ID Thomas Edison State University General Chemistry I with Labs(CHE-121 Section no Semester and year Written Assignment

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

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Name: College ID:Thomas Edison State UniversityGeneral Chemistry I with Labs (CHE-121)Section no.:Semester and year: 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) (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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