Cherries Posted May 14, 2018 Report Share Posted May 14, 2018 Which element forms more than one stable positive ion? A. Ca B. Cr C. Zn D. Ba The answer is B, but how? Thanks! Reply Link to post Share on other sites More sharing options...
kw0573 Posted May 15, 2018 Report Share Posted May 15, 2018 I was wondering from which paper and timezone did you get this paper? It looks to be HL content since 2009. The full explanation is explored in an inorganic or physical chemistry course on molecular orbitals. In HL they use successive ionization energies to explain that transition metals of different groups than scandium or zinc can form multiple stable charges. Some of the more familiar examples may be iron or copper. Reply Link to post Share on other sites More sharing options...
Cherries Posted May 15, 2018 Author Report Share Posted May 15, 2018 Paper 1, November 2015, and TZ0 Reply Link to post Share on other sites More sharing options...
kw0573 Posted May 15, 2018 Report Share Posted May 15, 2018 I read the 2009 syllabus more carefully and it wanted SL students to know about this topic. This has since been taken out and moved to HL only. Metals with multiple stable charges include many transition metals not in the column of scandium or zinc. 1 Reply Link to post Share on other sites More sharing options...
Cherries Posted May 16, 2018 Author Report Share Posted May 16, 2018 Okay, thank you! Reply Link to post Share on other sites More sharing options...
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