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The SiS2 molecule is linear.

First, establish a Lewis structure; the Silicon atom forms the center of the structure, which the two Sulfur atoms bond to. In order to satisfy the octet rule and establish neutral formal charges, double bonds form between each Sulfur atom and the Silicon. This configuration creates two electron domains from the two double bonds; single, double and triple bonds all form one electron domain each. Since there are no sets of un-bonded paired electrons, the system only has two electron domains, both of which formed from bonds. This leaves only one possible shape, which is linear.

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Q: What is the molecular geometry of SiS2?
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