Chapter 11, Problem 56AE

Interpretation Introduction

Interpretation:

The spheres representing the given ions $B{r}^{-},S{e}^{2-},R{b}^{+},S{r}^{2+},$ and $Kr$ have to be correctly identified from the given spheres 1, 2, 3, 4, and 5.

Concept Introduction:

Atomic radii:

The atomic radius of an atom can be defined as the distance between the center of the nucleus and the outermost electron.  In the periodic table, across a period atomic radius decreases and atomic radius increases down the group. For isoelectronic species, the atomic radii increase with decrease of charge on the element.