We can draw three inequivalent Lewis structures for carbonyl sulfide , SCO . The

Question

We can draw three inequivalent Lewis structures for carbonyl sulfide, SCO. The concepts of formal charge andelectronegativity can help us choose the structure that is the best representation.

1. Assign formal charges to the elements in each of the structures below.

Formal Charge
S

C

O

___


_____
____

____


_____
_____

____

_______
_____

2. The best Lewis structure for SCO is ___ABC.

2.

We can draw three inequivalent Lewis structures for the cyanate ion, OCN-. The concepts of formal charge andelectronegativity can help us choose the structure that is the best representation.

1. Assign formal charges to the elements in each of the structures below.

Formal Charge
O

C

N

____

_____
_____

______

_______
_______

______

_____
______

2. The best Lewis structure for OCN- is ___ABC.

3.We can draw three inequivalent Lewis structures for the selenite ion, SeO32-. The concepts of formal charge andelectronegativity can help us choose the structure that is the best representation.


1. Assign formal charges to the elements in each of the structures below.

Note: Count oxygen atoms starting from the left for each structure.

Formal Charge
Se

O1

O2

O3

2. The best Lewis structure for SeO32- is ___ABC.

A

B

C

Formal Charge
S

C

O

___


_____
____

____


_____
_____

____

_______
_____

Explanation / Answer

Formal charge=(valence e^-)-(1/2bonding e^-) -lone e^-

1-SCO

for str. A formal charge

S=0,C=0,O=0

for str B formal charge

S=-1,C=0,O==1

for str. C formal charge

S=+1,C=0, O=-1

most stable str. is str. with no formal charge

so str A is most stable.

2-forOCN^-

formal charge in str A

O=+1,C=0, N=-2

formal charge in str.B

O=0,C=0,N=-1

formal charge on str C

O=-1,C=0,N=0

best str. is C, because most electronegative O have -1 charge

3-ForSeO3^-3

for str A

formal charge

Se=6-5-2=-1,O1=6-2-4=0,O2=6-2-4=0,O3=6-1-6=-1

for str B

Se=6-3-2=+1,O1=6-1-6=-1,O2=-1,O3=-1

for strC

formal charge,

Se=6-4-2=0,O1=6-2-4=0,O2=6-1-6=-1,O3=6-1-6=-1

best Lewis str. is C

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