title: Ionic radii for Group 1 halide crystals and ion-pairs.
abstract: Internuclear separations calculated from empirical soft-sphere radii for seventeen crystalline Group 1 halides with rock-salt structures and from empirical hovering-sphere radii for fourteen gaseous Group 1 halide ion-pairs agree well with experimental measurements. Two lithium and four fluoride ion-pairs appear to be anomalous. Soft-sphere ionic radii are compared with atomic radii of noble gases.
authors.affiliation: Cranleigh School, Cranleigh, Surrey, GU6 8QQ, UK.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Collin
authors.forename: Barry C
authors.initials: BC
authors.lastname: Smith