The Molecular Shape with Two Electron Groups Linear Arrangement

The Molecular Shape with Two Electron Groups (Linear Arrangement) 

Gaseous beryllium chloride (BeCl2) is a linear molecule (AX2). Gaseous beryllium compounds are electron deficient, with only two electron pairs around the central Be atom  

In carbon dioxide, the central C atom forms two double bonds with the O atoms  

Each double bond acts as one electron group and is oriented 180° away from the other, so CO2 is linear. Notice that the lone pairs on the O atoms of CO2 or on the Cl atoms of BeCE are not involved in the molecular shape only electron groups around the central atom influence shape. 

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