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Simple Procedure for writing the Lewis Structures of CN+

Simple Procedure for writing Lewis Structures of CN+

# A simple procedure for writing the Lewis structures of CN^{+}

Let us consider the case of the CN^{+} cation:

__Step 1__: Connect the atoms with
single bonds.

__Step 2__: Calculate the # of electrons in pi bonds (pi bonds, multiple bonds) using formula (1):

Where n in this case is 2 since CN^{+} consists
of 2 atoms.

Where V = (4 + 5
) - charge = 9 – 1 = 8

Therefore, P = 6n
+ 2 – V = 6 *2 + 2 – 8 = 6 Therefore there are 6 pi electrons (pi electrons). So, there
are 1) either 3 double bonds or 1 triple bond and an unshared electron pair.

__Step 3 & 4__: Two atoms cannot be connected with 3 double bonds. However, it is possible that will be connected by a double bond. Two unshared electron pairs will be also added – so that in total 6 pi electrons will be present:

Another possibility is that the two atoms will be connected by a triple bond. In this
case an unshared electron pair will be added so that 6 pi electrons will be
present. The **Lewis dot structures of the CN**^{+}cation are shown below:

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__References__

- G.N. Lewis, J.A.C.S, 38, 762-785, (1916)
- E. C. McGoran, J. Chem. Educ., 68, 19-23 (1991)
- A.B.P. Lever, J. Chem. Educ., 49, 819-821, (1972)

__Key Terms__

__electron dot Lewis structures__**, **__Lewis Structures and the Octet Rule__**, **** **__how can we draw the CN+ Lewis dot structure__

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