Chemistry Learner

It's all about Chemistry

Home / Physical Chemistry / Cyanide Ion (CN-) Formal Charge

Cyanide Ion (CN-) Formal Charge

In the cyanide ion (CN), the carbon (C) atom shares a triple covalent bond with the nitrogen (N) atom. Its Lewis structure is shown below.

CN Formal Charge

Let us calculate the formal charge of the CN molecule by determining the formal charges on C and N.

Carbon

V = 4, N = 2, B = 6

Therefore, formal charge on carbon is given by,

qf = 4 – 2 – 6/2 = -1

The formal charge on C in CNis -1.

Nitrogen

V = 5, N = 2, B = 6

Therefore, formal charge on nitrogen is given by,

qf = 5 – 2 – 6/2 = 0

The formal charge on N in CNis zero.

The net formal charge is: -1 + 0 = -1

The formal charge of cyanide ion is -1.

Leave a Reply

Your email address will not be published.