ConceptCheck2

ConceptCheck2 - of the S atom is 1 s 2 2 s 2 2 p 6 3 s 2 3...

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17 Concept Check 2.1 Question: Why are the atomic weights of the elements generally not integers? Cite two reasons. Answer: The atomic weights of the elements ordinarily are not integers because: (1) the atomic masses of the atoms normally are not integers (except for 12 C), and (2) the atomic weight is taken as the weighted average of the atomic masses of an atom's naturally occurring isotopes.
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23 Concept Check 2.2 Question: Give electron configurations for the Fe 3+ and S 2- ions. Answer: The Fe 3+ ion is an iron atom that has lost three electrons. Since the electron configuration of the Fe atom is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 6 4 s 2 (Table 2.2), the configuration for Fe 3+ is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 5 . The S 2- ion a sulfur atom that has gained two electrons. Since the electron configuration
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Unformatted text preview: of the S atom is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 4 (Table 2.2), the configuration for S 2-is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 . 30 Concept Check 2.3 Question: Offer an explanation as to why covalently bonded materials are generally less dense than ionically or metallically bonded ones. Answer: Covalently bonded materials are less dense than metallic or ionically bonded ones because covalent bonds are directional in nature whereas metallic and ionic are not; when bonds are directional, the atoms cannot pack together in as dense a manner, yielding a lower mass density....
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ConceptCheck2 - of the S atom is 1 s 2 2 s 2 2 p 6 3 s 2 3...

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