Chapter 6.1, Problem 4SSC

Interpretation Introduction

(a)

Interpretation:

Whether Lithium is a representative element or a transition element needs to be identified.

Concept introduction:

The elements present in both s-block and p-block of the periodic table except noble gases are termed as representative elements. There are two groups in s-block, group I and II and five groups in p-block excluding noble gas, Group 13 to17.

Answer to Problem 4SSC

Lithium is a representative element.

Explanation of Solution

Lithium is the element of atomic number 3. It belongs to group I of the periodic table, it means it belong to the s-block of the periodic table. So, it is a representative element.

(b)

Interpretation Introduction

Interpretation:

Whether Platinum is a representative element or a transition element needs to be determined.

Concept introduction:

Transition elements include all the elements of the d-block of the periodic table. d-block consists of groups from 3 to 12. d-block elements are present in the centre of the periodic table between s and p block. These elements are called as transition elements because of their incomplete d-subshell.

Answer to Problem 4SSC

Platinum is a transition element.

Explanation of Solution

Platinum is the element present in group 10 and 6^th period of the periodic table. Its atomic number is 78. As it belongs to group 10, it is a d-block element. d-block elements are called as transition metals. So, platinum is a transition element.

(c)

Interpretation Introduction

Interpretation:

Whether Promethium is a representative element or a transition element needs to be determined.

Concept introduction:

The elements that belong to the f-block of the periodic table are known as inner transition elements because they form transition series within the transition elements of d-block of the periodic table.

Answer to Problem 4SSC

Promethium is an inner transition element.

Explanation of Solution

The f-block contains two types of elements, lanthanoids and actinoids. Promethium is the element of atomic number 61 and it belongs to the lanthanoids of f-block of the periodic table. All the f-block elements are termed as inner transition elements.

(d)

Interpretation Introduction

Interpretation:

Whether Carbon is a representative element or a transition element needs to be determined.

Concept introduction:

The elements present in both s-block and p-block of the periodic table except noble gases are termed as representative elements. There are two groups in s-block, group I and II and five groups in p-block excluding noble gas, Group 13 to17.

Answer to Problem 4SSC

Carbon is a representative element.

Explanation of Solution

Carbon is an element present in group 14 and 2^nd period. Its atomic number is 6. As carbon belongs to group 14, it means it belongs to p-block of the periodic table. So, Carbon is a representative element.