Ch.10 - Chemical Bonding I: The Lewis Model

Tro - Chemistry: A Molecular Approach 6th Edition

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Tro 6th Edition

Ch.10 - Chemical Bonding I: The Lewis Model

Problem 62b

Chapter 10, Problem 62b

Refer to Figure 10.10 to estimate the percent ionic character of the ClF bond.

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Identify the electronegativity difference between Cl and F. The electronegativity of Cl is approximately 3.0 and for F it is approximately 4.0.

Calculate the electronegativity difference: |4.0 - 3.0| = 1.0.

Locate the value of 1.0 on the x-axis (Electronegativity Difference) of the provided graph.

Find the corresponding point on the y-axis (Percent Ionic Character) that aligns with the electronegativity difference of 1.0.

Estimate the percent ionic character of the ClF bond by reading the y-axis value at the point where the electronegativity difference is 1.0.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Ionic Character

Ionic character refers to the degree to which a bond between two atoms exhibits ionic properties, as opposed to covalent properties. It is influenced by the difference in electronegativity between the two atoms involved in the bond. A higher ionic character indicates a greater transfer of electrons from one atom to another, resulting in the formation of charged ions.

Electronegativity Difference

Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond. The electronegativity difference between two bonded atoms can help predict the bond's character; larger differences typically indicate more ionic character. For example, a difference greater than 1.7 often suggests an ionic bond, while smaller differences indicate covalent bonding.

Percent Ionic Character vs. Electronegativity Difference Graph

The graph plots percent ionic character against the electronegativity difference for various compounds, illustrating a trend where an increase in electronegativity difference correlates with higher percent ionic character. This visual representation helps in estimating the ionic character of specific bonds, such as the ClF bond, by locating its electronegativity difference on the x-axis and determining the corresponding ionic character on the y-axis.

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