NCERT Exercise 4.5 - The d- and f-Block Elements
Question: Irregular variation of ionisation enthalpies is mainly attributed to varying degree of stability of different 3d-configurations (e.g., d 0, d 5, d 10 are exceptionally stable).
Answer: **NCERT answer:** Stable oxidation states. 3d3 (Vanadium): (+2), +3, +4, and +5 3d5 (Chromium): +3, +4, +6 3d5 (Manganese): +2, +4, +6, +7 3d8 (Nickel): +2, +3 (in complexes) 3d4 There is no d4 con...
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