Answer
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Step 1:: Determine the total number of valence electrons in the OCl\_{2} molecule.
The total number of valence electrons in a molecule is the sum of the valence electrons of each atom. Oxygen (O) is in group 6 and has 6 valence electrons, while Chlorine (Cl) is in group 7 and has 7 valence electrons. Since there are two Chlorine atoms in OCl\_{2}, the total number of valence electrons is: \text{Total valence electrons} = 6 (\text{Oxygen}) + 2 \times 7 (\text{Chlorine}) = 26 \text{ valence electrons}
Step 2:: Draw the skeletal structure of the molecule.
To draw the skeletal structure, place the least electronegative atom, Oxygen, in the center, and connect it to the other atoms with single bonds. In this case, there is only one Oxygen atom and two Chlorine atoms, so the structure is already determined: ``` O - Cl - O ```
Step 3:: Distribute the remaining valence electrons as lone pairs on the atoms.
Now, distribute the remaining valence electrons as lone pairs on the atoms to complete their octets. Each line represents a pair of shared electrons (a single bond), and each dot represents an unshared pair of electrons (a lone pair). ``` O : - Cl - O : : ```
Step 4:: Check the formal charges of the atoms.
Calculate the formal charge for each atom by subtracting the number of valence electrons it has in the Lewis structure from the number of valence electrons it has in its neutral state. - Oxygen (O): 6 (valence electrons) - 4 (shared electrons) - 2 (lone pairs) = + 2 formal charge - Chlorine (Cl): 7 (valence electrons) - 6 (shared electrons) - 2 (lone pairs) = 0 formal charge
Step 5:: Adjust the Lewis structure if needed.
Since Oxygen has a positive formal charge, we can move one of its lone pairs to form a double bond with one of the Chlorine atoms, reducing its formal charge to zero. ``` O = - Cl - O : : ```
Step 6:: Recalculate the formal charges.
- Oxygen (O): 6 (valence electrons) - 4 (shared electrons) - 1 (lone pair) = 1 (formal charge) - Chlorine (Cl): 7 (valence electrons) - 6 (shared electrons) - 2 (lone pairs) = 0 (formal charge)
Step 7:: Finalize the Lewis structure.
The final Lewis structure for OCl\_{2} is: ``` O = - Cl - O : : ```
Final Answer
The Lewis structure for OCl\_{2} is shown above, with Oxygen having a formal charge of + 1 and Chlorine having a formal charge of 0.
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