Method for Lewis dot structures: The nitrate ion NO3-
A simple procedure for writing Lewis Dot Structures was given in a previous article entitled “Lewis Structures and the Octet Rule”. Several worked examples relevant to this procedure were given in previous posts please see the Sitemap - Table of Contents (Lewis Electron Dot Structures).
Let us consider the case of the nitrate ion NO3-. What are the Lewis structures of NO3-?
Step 1: Connect the atoms with single bonds.
Step 2: Calculate the # of electrons in π bonds (multiple bonds) using formula (1) :
Where n in this case is 4. Where V = (5 +6*3) – (-1) = 24 , V is the number of valence electrons of the ion. Therefore, P = 6n + 2 – V = 6 * 4 + 2 – 24 = 2 So, there is 1 double bond.
Step 3 & 4: The Lewis dot resonance structures of the nitrate ion NO3- are as follows:
Therefore, there are 3 possible Lewis resonance structures for NO3-.
The above simple four-step method for drawing Lewis structures is presented in the following video:
- 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)
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