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MgCl2 is an ionic compound formed between Mg2+ and Cl− ions. Mg2+ has an electron configuration of [Ne]3s0, which means that it has no valence electrons to participate in covalent bonding. As a result, MgCl2 exists as an ionic solid, with the Mg2+ and Cl− ions arranged in a crystal lattice. In the solid state, MgCl2 does not have a well-defined molecular geometry.