Chapter 2, Problem 17P

Interpretation Introduction

(a)

Interpretation:

The mass number of an atom having 22 protons, 22 electrons and 26 neutrons should be calculated.

Concept Introduction:

Mass number is the sum of number of protons and neutrons in an atom.

Answer to Problem 17P

The mass number of an atom having 22 protons, 22 electrons and 26 neutrons is 48.

Explanation of Solution

Given information:

$\begin{array}{l} Numb\text{e}rofprotons=22\hfill \\ Numb\text{e}rofelectrons=22\hfill \\ Numb\text{e}rofn\text{e}utrons=26\hfill \end{array}$

Mass number can be calculated as follows:

$\begin{array}{l}\text{A }=n_p+n_n\hfill \\ \text{ = 22 + 26}\hfill \\ = 48\hfill \end{array}$

Therefore, the mass number is 48.

Interpretation Introduction

(b)

Interpretation:

The mass number of an atom having 76 protons, 76 electrons and 114 neutrons should be calculated.

Concept Introduction:

Mass number is the sum of number of protons and neutrons in an atom.

Answer to Problem 17P

The mass number of an atom having 76 protons, 76 electrons and 114 neutrons is 190.

Explanation of Solution

Given information:

$\begin{array}{l} Numb\text{e}rofprotons=76\hfill \\ Numb\text{e}rofelectrons=76\hfill \\ Numb\text{e}rofn\text{e}utrons=114\hfill \end{array}$

Mass number can be calculated as follows:

$\begin{array}{l}\text{a}=n_p+n_n\hfill \\ = 76+114\hfill \\ = 190\hfill \end{array}$

Therefore, mass number of the atom is 190.

Interpretation Introduction

(c)

Interpretation:

The mass number of an atom having 34 protons, 34 electrons and 45 neutrons should be calculated.

Concept Introduction:

Mass number is the sum of number of protons and neutrons in an atom.

Answer to Problem 17P

The mass number of an atom having 34 protons, 34 electrons and 45 neutrons is 79.

Explanation of Solution

Given information:

$\begin{array}{l} Numb\text{e}rofprotons=34\hfill \\ Numb\text{e}rofelectrons=34\hfill \\ Numb\text{e}rofn\text{e}utrons=45\hfill \end{array}$

Mass number can be calculated as follows:

$\begin{array}{l}\text{a}=n_p+n_n\hfill \\ = 34+45\hfill \\ = 79\hfill \end{array}$

Therefore, mass number is 79.

Interpretation Introduction

(d)

Interpretation:

The mass number of an atom having 94 protons, 94 electrons and 150 neutrons should be calculated.

Concept Introduction:

Mass number is the sum of number of protons and neutrons in an atom.

Answer to Problem 17P

The mass number of an atom having 94 protons, 94 electrons and 150 neutrons is 244.

Explanation of Solution

Given information:

$\begin{array}{l}Numb\text{e}rofprotons=94\hfill \\ Numb\text{e}rofelectrons=94\hfill \\ Numb\text{e}rofn\text{e}utrons=150\hfill \end{array}$

Mass number can be calculated as follows:

$\begin{array}{l}\text{A }=n_p+n_p\hfill \\ = 94+150\hfill \\ = 244\hfill \end{array}$

Therefore, mass number is 244.