1) The ions S 2- , Cl - , K + ,Ca 2+ , and Sc 3+ have the same total number ofel
ID: 687915 • Letter: 1
Question
1) The ions S2-, Cl-, K+,Ca2+, and Sc3+ have the same total number ofelectrons as the noble gas Argon. How would you expect the radii ofthese ions to vary? Would you expect to see the same variation inthe series O2-, F-, Na+,Mg2+, and Al3+, in which each ions has thesame total number of electrons as the noble gas neon? Why or whynot? 2) Explain why some chemists consider Hydrogen to be asemimetal. 1) The ions S2-, Cl-, K+,Ca2+, and Sc3+ have the same total number ofelectrons as the noble gas Argon. How would you expect the radii ofthese ions to vary? Would you expect to see the same variation inthe series O2-, F-, Na+,Mg2+, and Al3+, in which each ions has thesame total number of electrons as the noble gas neon? Why or whynot? 2) Explain why some chemists consider Hydrogen to be asemimetal.Explanation / Answer
Yes, there is a variation in the radii.Consider O2-and Al3+ both have same no. of electrons ,but in O2- the nuclear charge is 8 where as incase of Al3+ the nuclear charge is 13.So ,there exists more nuclear force on the Al3+ resulting in less radii. Therefore the order of decreasing radii is given byO2- > F-> Na+ >Mg2+ > Al3+ .Related Questions
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