Chapter 7, Problem 112A

(a)

Interpretation Introduction

Interpretation: The symbol and complete electron configuration of the given element is to be stated.

Concept Introduction : Periodic table is the representation of the elements. There are 18 groups and 7 period in the periodic table. Elements are arranged in the increasing order of their atomic number.

Answer to Problem 112A

The symbol and complete electron configuration of the given element is K and $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$ .

Explanation of Solution

The given element belongs to Group 1A, Period 4. It is potassium and its symbol is K. The complete electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$ .

(b)

Interpretation Introduction

Interpretation: The symbol and complete electron configuration of the given element is to be stated.

Concept Introduction : Periodic table is the representation of the elements. There are 18 groups and 7 period in the periodic table. Elements are arranged in the increasing order of their atomic number.

Answer to Problem 112A

The symbol and complete electron configuration of the given element is Al and $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$ .

Explanation of Solution

The given element belongs to Group 3A, Period 3. It is aluminium and its symbol is Al. The complete electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$ .

(c)

Interpretation Introduction

Interpretation: The symbol and complete electron configuration of the given element is to be stated.

Concept Introduction : Periodic table is the representation of the elements. There are 18 groups and 7 period in the periodic table. Elements are arranged in the increasing order of their atomic number.

Answer to Problem 112A

The symbol and complete electron configuration of the given element is Se and $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^4$ .

Explanation of Solution

The given element belongs to Group 6A, Period 3. It is selenium and its symbol is Se. The complete electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^4$ .

(d)

Interpretation Introduction

Interpretation: The symbol and complete electron configuration of the given element is to be stated.

Concept Introduction : Periodic table is the representation of the elements. There are 18 groups and 7 period in the periodic table. Elements are arranged in the increasing order of their atomic number.

Answer to Problem 112A

The symbol and complete electron configuration of the given element is Ra and $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p^{6}7s^2$ .

Explanation of Solution

The given element belongs to Group 2A, Period 6. It is radium and its symbol is Ra. The complete electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p^{6}7s^2$ .