I think you misunderstood the question.
If Sr forms SrCl2 with Cl2 the problem is asking for an element X2 that would react WITH Sr. I would go with Br2 or I2 or F2 to form SrBr2, SrI2, SrF2.
Cl2 reacts with the element Sr to form an ionic compound. Based on periodic properties, identify a molecule, X2, that is likely to to react with Sr in a way similar to how Cl2 reacts with Sr. Justify your choice.
*****I think it could be MgCl because Cl2 and Sr combine to form SrCl, just like how Mg would combine with Cl2 to form MgCl
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