Chapter 2, Problem 2.21QP

(a)

Interpretation Introduction

Interpretation:

Mass number for the given atom need to be determined.

Concept introduction:

The total number of protons in an atom is said to be its atomic number.  By using the total number of protons and neutrons all the atoms can be identified.  Atomic number is denoted by “Z”.  Atomic number is a characteristic of each and every atom in an element.

The total number of neutrons and protons of an atom is said to be its mass number.  By using the total number of protons and neutrons all the atoms can be identified.  Mass number is denoted by “A”.

Atomic number does not change for atoms present in an element while mass number can change due to difference in number of neutrons.  These are known as isotopes.

Total number of neutrons present in an atom can be found out of finding the difference between mass number and atomic number.

$\text{mass number (A) = number of protons (Z) + number of neutrons}$

(b)

Interpretation Introduction

Interpretation:

Mass number for the given atom need to be determined.

Concept introduction:

The total number of protons in an atom is said to be its atomic number.  By using the total number of protons and neutrons all the atoms can be identified.  Atomic number is denoted by “Z”.  Atomic number is a characteristic of each and every atom in an element.

The total number of neutrons and protons of an atom is said to be its mass number.  By using the total number of protons and neutrons all the atoms can be identified.  Mass number is denoted by “A”.

Atomic number does not change for atoms present in an element while mass number can change due to difference in number of neutrons.  These are known as isotopes.

Total number of neutrons present in an atom can be found out of finding the difference between mass number and atomic number.

$\text{mass number (A) = number of protons (Z) + number of neutrons}$

(c)

Interpretation Introduction

Interpretation:

Mass number for the given set of atoms needs to be determined.

Concept introduction:

The total number of protons in an atom is said to be its atomic number.  By using the total number of protons and neutrons all the atoms can be identified.  Atomic number is denoted by “Z”.  Atomic number is a characteristic of each and every atom in an element.

The total number of neutrons and protons of an atom is said to be its mass number.  By using the total number of protons and neutrons all the atoms can be identified.  Mass number is denoted by “A”.

Atomic number does not change for atoms present in an element while mass number can change due to difference in number of neutrons.  These are known as isotopes.

Total number of neutrons present in an atom can be found out of finding the difference between mass number and atomic number.

$\text{mass number (A) = number of protons (Z) + number of neutrons}$

(d)

Interpretation Introduction

Interpretation:

Mass number for the given atom need to be determined.

Concept introduction:

The total number of protons in an atom is said to be its atomic number.  By using the total number of protons and neutrons all the atoms can be identified.  Atomic number is denoted by “Z”.  Atomic number is a characteristic of each and every atom in an element.

The total number of neutrons and protons of an atom is said to be its mass number.  By using the total number of protons and neutrons all the atoms can be identified.  Mass number is denoted by “A”.

Atomic number does not change for atoms present in an element while mass number can change due to difference in number of neutrons.  These are known as isotopes.

Total number of neutrons present in an atom can be found out of finding the difference between mass number and atomic number.

$\text{mass number (A) = number of protons (Z) + number of neutrons}$