Chapter 11, Problem 55AE

Interpretation Introduction

Interpretation:

The atoms of sodium, cesium and argon have to be correctly identified from the given spheres 1, 2 and 3.

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.