23 - Chemistry 1000 Lecture 23: The chalcogens (group 16)...

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Unformatted text preview: Chemistry 1000 Lecture 23: The chalcogens (group 16) Marc R. Roussel The chalcogens I Group 16 (O, S, Se, Te, Po) I Transition from nonmetallic to metallic behavior from top to bottom of group O and S are nonmetals (electrical insulators) Se and Te are metalloids (semiconductors) Po is a metal I Both the elements (O 2 , S) and compounds (CO 2 , H 2 O, H 2 S, metal oxides, metal sulfides) are abundant in nature for O and S I Se and Te are rare elements I Po is a radioactive element whose longest lived isotope has a half-life of just 3 years Enthalpy of electronic attraction revisited I The (first) enthalpy of electronic attraction (Δ ea H 1 ) is defined as the enthalpy change in the reaction X (g) + e- → X- (g) I For- 2 anions, we are also interested in the second enthalpy of electronic attraction (Δ ea H 2 ), i.e. the enthalpy change for X- (g) + e- → X 2- (g) I Some data: O S Δ ea H 1 / kJmol- 1- 141- 201 Δ ea H 2 / kJmol- 1 798 640 I Note that the sum of the two enthalpies of electronic...
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This note was uploaded on 03/03/2012 for the course CHEM 1000 taught by Professor Marc during the Fall '06 term at Lethbridge College.

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23 - Chemistry 1000 Lecture 23: The chalcogens (group 16)...

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