Molecular compounds are usually exceptions to the law of definite proportions composed of two or more transition elements composed of two or more nonmetallic elements composed of positive and negative ions

The answer is composed of two or more non-metallic elements. Molecular compounds hold two or more nonmetals. Typically you can identify you are dealing with a molecular compound for the reason that the first element in the compound name is a nonmetal. 

Naming and Writing Formulas for Molecular Compounds Quiz

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answer; talc and gypsum;