Chapter 3.2, Problem 3.5P

(a)

Interpretation Introduction

Interpretation:

The charge on the ion of magnesium has to be determined using the group number.

Concept Introduction:

Determining the charge of an ion using group number:

The element is located on the periodic table.

A metal that is present in groups $\text{1A,2A}$ or $\text{3A}$ forms a cation that is equal in charge to the group number.

  $\text{Charge}\text{on the}\text{cation=Group}\text{number}$

A non-metal that is present in groups $\text{5A,6A}$ and $\text{7A}$ forms an anion, whose charge equals $\text{8-}\left(\text{the}\text{group}\text{number}\right).$

  $\text{Charge}\text{on the}\text{anion=8-Group}\text{number}$

(b)

Interpretation Introduction

Interpretation:

The charge on the ion of iodine has to be determined using the group number.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The charge on the ion of selenium has to be determined using the group number.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

The charge on the ion of rubidium has to be determined using the group number.

Concept Introduction:

Refer to part (a).