O'Reilly logo

Chemistry: 1,001 Practice Problems For Dummies by Richard H. Langley, Heather Hattori

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 8

Molecular Geometry

The difference in the electronegativity between two atoms is an indicator of the polarity of the bond between the elements. The difference ranges from 0 to about 3, and the bond ranges from nonpolar to polar to ionic.

The position of an element on the periodic table indicates the number of valence electrons on an atom. The key to a Lewis dot diagram is the sum of the valence electrons of all atoms in a species plus electrons indicated by the charge on an anion (negative ion) or minus electrons indicated by the charge on a cation (positive ion). A correct diagram must indicate all of these electrons. The bonds and lone pairs around an atom in a Lewis dot diagram indicate the shape and polarity of the species.

The Problems You’ll Work On

In this chapter, you work with molecular geometry in the following ways:

check.png Counting electrons in Lewis dot diagrams

check.png Predicting bond types based on electronegativity values

check.png Recognizing molecular shapes

check.png Identifying polarity in bonds and molecules

Note: For access to the periodic table, see the Appendix.

What to Watch Out For ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required