Which Lewis electron-dot diagram is correct for CO2?

A. :O=C=O:
B. :O-C=O:
C. :O=C-O:
D. :O=CO:

Question

Which Lewis electron-dot diagram is correct for CO2?

A. :O=C=O:
B. :O-C=O:
C. :O=C-O:
D. :O=CO:

CramX · Accepted Answer

Step 1: :. The Lewis electron-dot structure for CO2 should follow the octet rule, where each atom (C and O) is surrounded by 8 electrons. Since carbon is in the middle, it will share electrons with both oxygen atoms through double bonds. Step 2: :. Start by drawing the carbon atom with 4 points around it representing the 4 valence electrons. \begin{array}{cccc} \cdot & \cdot & \cdot & \cdot \ 	ext{C} & & & \end{array} Step 3: :. Next, add the oxygen atoms with 6 points around them representing their 6 valence electrons. \begin{array}{cccc} \cdot & \cdot & \cdot & \cdot \ 	ext{O} & - & 	ext{C} & - & 	ext{O} \ \cdot & \cdot & \cdot & \cdot \ \end{array} Step 4: :. Form double bonds between the carbon and each oxygen atom by moving 4 electrons from the oxygen atoms to the middle carbon atom. This will give each oxygen atom 8 electrons (fulfilling the octet rule) and the carbon atom 8 electrons as well. \begin{array}{cccc} \cdot & \cdot & & \cdot \ 	ext{O} & = & 	ext{C} & = \ \cdot & \cdot & & \cdot \ \end{array} Final Answer: The correct Lewis electron-dot diagram for CO2 is option C: :O=C-O:.

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