Chapter 7, Problem 109A

(a)

Interpretation Introduction

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

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

Answer to Problem 109A

The symbol and electron configuration of the given atom is N and $1s^{2}2s^{2}2p^3$ respectively.

Explanation of Solution

The given atom is nitrogen. It belongs to group 5A in the periodic table. The atomic number of nitrogen is 7 and its symbol is N and its electron configuration is $1s^{2}2s^{2}2p^3$ .

(b)

Interpretation Introduction

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

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

Answer to Problem 109A

The symbol and electron configuration of the given atom is Be and $1s^{2}2s^2$ respectively.

Explanation of Solution

The given atom is beryllium. It belongs to group 2A in the periodic table. The atomic number of beryllium is 4 and its symbol is Be and its electron configuration is $1s^{2}2s^2$ .

(c)

Interpretation Introduction

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

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

Answer to Problem 109A

The symbol and electron configuration of the given atom is P and $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$ respectively.

Explanation of Solution

The given atom is phosphorus. It belongs to group 5A in the periodic table. The atomic number of phosphorus is 15 and its symbol is P and its electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$ .

(d)

Interpretation Introduction

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

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

Answer to Problem 109A

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

Explanation of Solution

The given atom is potassium. It belongs to group 1A in the periodic table. The atomic number of potassium is 19 and its symbol is K and its electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$ .