MediumChemistryHigh School (11–12)Chemical Bonding › Shapes of Molecules and Hybridisation Chemical Bonding › Lewis Structures and Ionic BondsNumerical

Lithium fluoride and sodium bromide can be studied as single molecules in a hot gas.

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Lithium fluoride and sodium bromide can be studied as single molecules in a hot gas. LiF has a dipole moment of $6.33\ \text{D}$ and a bond length of $156\ \text{pm}$ . NaBr has $9.12\ \text{D}$ and $250\ \text{pm}$ . Find the percent ionic character of each bond. Which is more ionic, and does that fit Fajans' rules?

Need a reminder? The key ideaShow

Percent ionic character $= \dfrac{\mu_{\text{measured}}}{e \times d} \times 100\%$ . A charge $e$ at $100\ \text{pm}$ gives $4.803\ \text{D}$ , and $1\ \text{D} = 3.336 \times 10^{-30}\ \text{C m}$ .

The worked solution

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