## Chemistry: The Central Science (13th Edition)

$K-F$ distance: $2.71$ angstroms $Na-Cl$ distance: $2.83$ angstroms $Na-Br$ distance: $2.98$ angstroms $Li-Cl$ distance: $2.57$ angstroms
$KF$, $NaCl$, $NaBr$, $LiCl$ 1) The ionic radii of the ions: - $K^+$: 1.52 angstroms - $F^-$: 1.19 angstroms - $Na^+$: 1.16 angstroms - $Cl^-$: 1.67 angstroms - $Br^-$: 1.82 angstroms - $Li^+$: 0.90 angstroms 2) To estimate cation-anion distance, we would sum the ionic radii of the two ions in each compound. In detail, - $K-F$ distance: $1.52+1.19=2.71$ angstroms - $Na-Cl$ distance: $1.16+1.67=2.83$ angstroms - $Na-Br$ distance: $1.16+1.82=2.98$ angstroms - $Li-Cl$ distance: $0.90+1.67=2.57$ angstroms