Chapter 2, Problem 2.57QE

(a)

Interpretation Introduction

Interpretation:

Silicon is a representative element, transition element or an inner transition element has to be identified from its position in periodic table.

Concept Introduction:

Elements are arranged in Periodic table according to their atomic number.  Periodic table contains Groups and Periods.  An element can be located by its Group number and period number.  A total of seven periods and eighteen groups are present in periodic table.

Periods are numbered from 1 to 7 and it is from top to bottom in Periodic table.  Groups are numbered from left to right.  The Group numbers are given as 1A, 2A, 3B to 8B, 1B, 2B, 3A to 8A.

The elements that are present in Group with A are known as representative elements while Group with B is known as transition elements.  Inner transition elements are the one that are known as $f$-block elements.

(b)

Interpretation Introduction

Interpretation:

Element $\text{Cr}$ is a representative element, transition element or an inner transition element has to be identified from its position in periodic table.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

Magnesium is a representative element, transition element or an inner transition element has to be identified from its position in periodic table.

Concept Introduction:

Refer part (a).

(d)

Interpretation Introduction

Interpretation:

Element $\text{Np}$ is a representative element, transition element or an inner transition element has to be identified from its position in periodic table.

Concept Introduction:

Refer part (a).