Well ion is a particle with positive charge (usually an atom that lose or get some electrons). In metals there are free electrons and the atom are in Bravais lattice. But I think that if we somehow get the Mg atoms they will group. For example it happens in electrolysis of NaOH.
I thing think that in 320 C H2O (in electrolysis of NaOH; this is how sodium was made for first time) will react realy fast with Na creating e protective layer of H2. The same as reaction of copper with 70% and 50% nitric acid.
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