Chapter 20, Problem 1E

Write the following isotopes in hyphenated form (e.g., “carbon-14”).

(a) $\text{N}\text{a}$

(b) $\text{A}\text{l}$

(c) $\text{K}\text{r}$

(d) $\text{I}\text{r}$

Interpretation Introduction

(a)

Interpretation:

The hyphenated form of isotope $\text{N}\text{a}$ should be written.

Concept Introduction:

The atomic number is equal to the number of protons of an element whereas sum of number of protons and number of neutrons is equal to mass number.

A form of chemical element having same atomic number but differ by mass number is known as isotopes. In hyphenated form of isotope, the name of chemical element is written before the mass number.

Answer to Problem 1E

sodium-24

Explanation of Solution

Given isotope is $\text{N}\text{a}$

Na is the symbol of sodium.

Mass number of sodium = 24

Atomic number of sodium =11

Therefore, the hyphenated form of $\text{N}\text{a}$ is sodium-24

Interpretation Introduction

(b)

Interpretation:

The hyphenated form of isotope $\text{A}\text{l}$ should be written.

Concept Introduction:

The atomic number is equal to the number of protons of an element whereas sum of number of protons and number of neutrons is equal to mass number.

A form of chemical element having same atomic number but differ by mass number is known as isotopes. In hyphenated form of isotope, the name of chemical element is written before the mass number.

Answer to Problem 1E

aluminium-29

Explanation of Solution

Given isotope is $\text{A}\text{l}$

Al is the symbol of aluminium.

Mass number of aluminium = 29

Atomic number of aluminium =13

Therefore, the hyphenated form of $\text{A}\text{l}$ is aluminium-29

Interpretation Introduction

(c)

Interpretation:

The hyphenated form of isotope $\text{K}\text{r}$ should be written.

Concept Introduction:

The atomic number is equal to the number of protons of an element whereas sum of number of protons and number of neutrons is equal to mass number.

A form of chemical element having same atomic number but differ by mass number is known as isotopes. In hyphenated form of isotope, the name of chemical element is written before the mass number.

Answer to Problem 1E

krypton-73

Explanation of Solution

Given isotope is $\text{K}\text{r}$

Kr is the symbol of krypton.

Mass number of krypton = 73

Atomic number of krypton =36

Therefore, the hyphenated form of $\text{K}\text{r}$ is krypton-73

Interpretation Introduction

(d)

Interpretation:

The hyphenated form of isotope $\text{I}\text{r}$ should be written.

Concept Introduction:

The atomic number is equal to the number of protons of an element whereas sum of number of protons and number of neutrons is equal to mass number.

A form of chemical element having same atomic number but differ by mass number is known as isotopes. In hyphenated form of isotope, the name of chemical element is written before the mass number.

Answer to Problem 1E

iridium-194

Explanation of Solution

Given isotope is $\text{I}\text{r}$

Ir is the symbol of iridium.

Mass number of iridium = 194

Atomic number of iridium =77

Therefore, the hyphenated form of $\text{I}\text{r}$ is iridium-194