Lewis structure for Si2H2

See Attached

Explanation:

From the neutral molecule formulae, there are two Silicon atoms and two hydrogen atoms;

Silicon has four (4) valence electrons while Hydrogen has  (1) one. To achieve stable electron configuration. Silicon needs its unfilled orbital to have 8 electrons while Hydrogen needs its only orbital to have 2 electrons. The involved atoms will share electrons to form covalent bonds as shown in the Lewis dot illustration (attached). Notice the double bond between the two Silicon

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explanation: