Explain why iron , cobalt, nickel, do not show the expected highest oxidation states of +8 , +9 , +10 respectively
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Co forms co+2 due to the loss of two electrons from 4s subshell and by further Loss of one more electron from 3d orbital forms co3+. In cobalt +2 & +3 oxidation are more stable due to the exchange energy of 3d6 electrons and does not lose electrons further. Hence co does not show +9 oxidation state.
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Explanation:
its because, oxidation states given by given metal atom or ion is equal to number of repaired electrons it has, since iron, cobalt and nickel has 4, 3 and 2 unpaired electrons respectively
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