Simple Method for writing Lewis Structures for Carbon Disulfide CS2
A simple procedure for writing Lewis Dot Structures was given in a previous post 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 Lewis dot structures of carbon disulfide CS2.
Step 1: Connect the atoms with single bonds. Carbon is the central atom since it is less electronegative.
Step 2: Calculate the # of electrons in π bonds (multiple bonds) using formula (1):
Where n in this case is 3 since CS2 consists of three atoms.
Where V = (4 + 6 + 6 ) = 16
Therefore, P = 6n + 2 – V = 6 * 3 + 2 – 16 = 4 So there are 4π electrons in CS2 and that means 2 double bonds or a triple bond must be added to the structure in Step 1.
Step 3 & 4: The Lewis structure for CS2 is as follows:
- 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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