Chapter 22, Problem 22.80SP

Interpretation Introduction

Interpretation:

“Look at the properties of the alkali metals summarized in table 22.3 and predict reasonable values for the melting boiling point density and atomic radius of francium” should be explained

Concept introduction:

• The energy which is required to remove an electron from a gaseous atom or ion is called Ionization energy. Generally, in the periodic table; ionization energy increases from left period to right period and, in the group it decreases as we move down a group.

• Atomic radius decreases in going from left to right across a period. This decrease can be explained in term of the increasing effective nuclear charge in going from left to right. This means that the valence electrons are down closer to the nucleus, decreasing the size of atom. Atomic radius increases down a group, due to the increases in the orbital sizes as well as principal quantum levels.