NCERT Exercise 4.36 - The d- and f-Block Elements
Question: Write down the number of 3d electrons in each of the following ions: Ti 2+, V 2+, Cr 3+, Mn 2+, Fe 2+, Fe 3+, Co 2+, Ni 2+ and Cu 2+. Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).
Answer: **NCERT answer:** Ti2+ = 2, V2+ = 3, Cr3+ = 3, Mn2+ = 5, Fe2+ = 6, Fe3+ = 5, CO2+ = 7, Ni2+ = 8, Cu2+ = 9
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