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Bromine trichloride

 Arrange atoms and create single bonds.

The first atom listed in the molecular formula is often the central atom in the Lewis structure. (A more precise description is that the least electronegative atom is usually the central atom.) A wrong choice in the central atom will usually result in the inability to create the Lewis structure.

A single bond is composed of two valence electrons and is noted as either (● ●) or (—). In this example, 8 electrons are used to create one single bond between each of the C-Cl atoms.

The C atom is placed in the center and surrounded by the Cl atoms. Single lines are drawn between the atoms representing shared pairs of electrons, which may be thought of as single bonds.

When actors lose an academy award to another actor they often say, “It was an honor just to be nominated.”

While not an actor, Gilbert Newton Lewis, an American chemist for whom the Lewis structure

model was named, can certainly relate to the honor of a nomination. While Dr. Lewis was nominated for a Nobel Prize 35 times, he never won. Although Lewis was denied winning the Nobel Prize multiple times, this did not reduce the impact he made on science;

rather he has the distinct honor of having been nominated for the award more than any

other scientist (thus far!). 7 ©Hands-On Labs, Inc.

Experiment Molecular Modeling and Lewis Structures

Step 3) Calculate the number of remaining valence electrons; then distribute the electrons with the goal of satisfying the duet rule or octet rule.

Since each single bond (represented by a line) contains 2 shared electrons, 8 electrons have already been added to the Lewis structure. As determined in step 1, the molecule contains 32 valence electrons total. Thus, there are 24 more electrons (32-8=24) to add to the Lewis structure.