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b) (CH3)2Be
I drew the Lewis structure no problem, but why is the shape tetrahedral?

It is tetrahedral about the carbon atom but it is linear about the Be atom.

By drawing VSEPR structure, it takes the shape of a tetrahedral for both of the carbons. It would look like two tetrahedral bonded together by the carbon. So H3C-CH2BeH. The H3C would be a tetrahedral and so would the CH2BeH.