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CHEM-121_Written Assignment 2 - Thomas Edison State College...

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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)
2Calculate the number of neutrons of239Pu.(3 points)
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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Term
Spring
Professor
Khurana
Tags
Chemistry, Atom, Chemical element, Inorganic Compounds

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