Unpaired electrons are found in only one of the following species. Indicate which one, and explain why: F-, Ca2+, Fe2+, S2-.
Which of the following species would you expect to be diamagnetic and which paramagnetic? (a) K+; (b) Cr3+; (c) Zn2+; (d) Cd; (e) Co3+; (f) Sn2+; (g) Br.