Problem: Which of these ions cannot form both high- and low-spin octahedral complexes:(a) Mn3+; (b) Nb3+; (c) Ru3+; (d) Ni2+ 

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Ions that have electron configurations d1, d2, d3, d8, and d9 cannot form both high and low-spin octahedral complexes.

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Which of these ions cannot form both high- and low-spin octahedral complexes:(a) Mn3+; (b) Nb3+; (c) Ru3+; (d) Ni2+ 

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