An unidentified metal, M, reacts with an unidentified halogen, X to form MX2.  When MX2 is heated it decomposes according to the following reaction: 2MX2(s) ---> 2MX(s)+X2(g) When 1.12g of MX2 is heated, 0.719 g of MX and 0.0025 moles of X2 are obtained.  What is the identity of M?

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