$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{percent}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{component}}{\mathbf{total}\mathbf{}\mathbf{mass}}{\mathbf{\times}}{\mathbf{100}}}$

The molar mass of chlorine = 35.45 g/mol

A chloride salt MCl_{2} is 63.89% chlorine by mass. What is the identity of M?

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