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Like Fe$\ce{Fe}$, it can be Fe2+$\ce{Fe^{2+}}$ or Fe 3+$\ce{Fe^{3+}}$, same with Ni$\ce{Ni}$ and Co$\ce{Co}$, what determines whether the ionic compound will be Fe2+$\ce{Fe^{2+}}$ or Fe3+$\ce{Fe^{3+}}$?
Like Fe, it can be Fe2+ or Fe 3+, same with Ni and Co, what determines whether the ionic compound will be Fe2+ or Fe3+?
Like $\ce{Fe}$, it can be $\ce{Fe^{2+}}$ or $\ce{Fe^{3+}}$, same with $\ce{Ni}$ and $\ce{Co}$, what determines whether the ionic compound will be $\ce{Fe^{2+}}$ or $\ce{Fe^{3+}}$?
