Thomas Edison State CollegeGeneral Chemistry I with Labs (CHE-121)Section no.: OL009Semester and year: FEB2015Written Assignment 2: Atomic Structure and Chemical CompoundsAnswer all assigned questions and problems, and show all work.1What is the mass number of an iron atom that has 28 neutrons?(3 points)
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2Calculate the number of neutrons of239Pu.(3 points)
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3Write the appropriate symbol for each of the following isotopes: (a)Z= 11,A= 23; (b)28,A= 64(6 points)(Reference: Chang 2.17)a23b)11Na284Define, with two examples, the following terms: (a) alkali metals, (b) alkaline earth metal,(c) halogens, and (d) noble gases.(8 points)Z=64Ni(Reference: Chang 2.22)aAlkali metals (1A): Lithium (Li); Sodium (Na)bAlkaline earth metal (2A): Magnesium (Mg); Calcium (Ca)cHalogen (7A): Fluorine (F); Chlorine (Cl)dNoble gases (8A): Helium (He); Neon (Ne)5Identify the following as elements or compounds: (a) NH3, (b) N2, (c) CO, (d) Co, and(e)He.(5 points)
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