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Why does cobalt form the 3 ion (or any other cation)?

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This question is a quite tough question. As Michael Flynn pointed out, cobalt's oxidation states and their reasoning. You can tell that Co forms many states but some of those are found on earth as they are stable and there is actually no direct explanation as to why it forms. There is no such rule. read more

Cobalt has the electron structure [math]\mathrm{[Ar]3d^74s^2}[/math], so it tends to lose its two 4s electrons easily to form Co(II) which is its most stable oxidation state and is pink in its hydrated form. read more

cobalt has the ground state electron configuration of [Ar] 4s2, 3d7 But when cobalt loses three electrons, it loses them from both the 4s and the 3d. It loses two electrons from the 3d in order to make the 3d half-filled, which has a high degree of stability, and it loses 1 electron from the 4s. read more

The coloured solution is propably a Cobalt complex solution, [ Co(NH3)6 ] 2+ whereas the ppt is a hydrate form of hydroxide with a different oxidation state given with NaOH. 03: Sodium Carbonate a) LILAC/PURPLE ppt was formed b) On heating the ppt turns more to a MAGENTA colour. Precipitation of Cobalt Carbonate. read more

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Why does cobalt form the 3+ ion (or any other cation)? - Quora
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