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These elements in are the first period in the d-block. They don’t only form +2 oxidation numbers but can go even higher. But if your trying to say why are they all having a 2+ ion in common, the simple answer is that they all experience a loss of two electrons and no less. As they are in between group 2 and group 3 of the periodic table, it makes sense for all of them to form the 2+ ion. Hope this helps!!
Asked by Dominique
How does an atom of lithium form an ionic bond with an atom of chlorine