Which of the following statements about the mass number of an atom is incorrect ? a. It has a unit defined as a dalton. b. On Earth, it equals the atomic weight. c. Unlike the atomic weight of an atom, it does not change when gravitational forces change. d. It equals the number of electrons in an atom. e. It is the sum of the protons and neutrons in the atomic nucleus.

Question

Want to see more full solutions like this?

Answer 1

Textbook Question

Chapter 2, Problem 1TYK

Which of the following statements about the mass number of an atom is incorrect?

a. It has a unit defined as a dalton.

b. On Earth, it equals the atomic weight.

c. Unlike the atomic weight of an atom, it does not change when gravitational forces change.

d. It equals the number of electrons in an atom.

e. It is the sum of the protons and neutrons in the atomic nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

The elements are made up one type of atoms which contain electrons, protons, and neutrons. The atoms contain a nucleus, which contains protons and neutrons in it. The electrons revolve around the nucleus in their orbital paths. The atomic number of an element is the total number of protons present in the nucleus.

Answer to Problem 1TYK

Correct answer:

It equals the number of electrons in an atom.

Explanation of Solution

Justification for the correct answer:

Option (d) is that it equals the number of electrons in an atom. The mass number is represented by the sum of protons and neutrons. It is taken so because the mass of a proton and a neutron is almost equal, which is 1.66×10−24 g and the mass of an electron is about 1800 times lesser than this. So, it is ignored. The mass number is not equal to the number of electrons in an atom. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is that its unit is Dalton. The mass of proton and neutron is given by a unit named Dalton (Da). So, it is an incorrect option.

Option (b) is that on earth, it equals its atomic weight. The atomic mass is called Atomic weight if the gravitational force is considered. The mass number equals atomic weight when it is affected by the Earth’s gravitational force. So, it is an incorrect option.

Option (c) is that unlike the atomic weight of an atom, it does not change when gravitational forces change. The weight changes with a change in gravitational force but the mass is not changed. So, it is an incorrect option.

Option (e) is that it is the sum of the protons and neutrons in the atomic nucleus. The atomic nucleus contains neutron and protons, whose summation gives the mass number. So, it is an incorrect option.

Hence, options (a), (b), (c) and (e) are incorrect.

Conclusion

Thus, it can be concluded that the mass number is independent of the number of electrons contained in an atom. It is equal to the sum of the number of protons and neutrons in the atomic nucleus.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Students have asked these similar questions

The atomic number gives thea. number of neutrons in the nucleus.b. number of protons in the nucleus.c. weight of the atom.d. number of protons in the valence shell.

Which of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All molecules consist of atoms. d. Free radicals are dangerous because they emit energy

Atoms are incredibly tiny, so small that most microscopes can't even see them, but atoms themselves are made of even smaller particles: protons, neutrons, and electrons. Which of the following describes where protons are located in an atom? A. A shell B. The nucleus C. Both the nucleus and a shell

Answer 2

Textbook Question

Chapter 2, Problem 1TYK

Which of the following statements about the mass number of an atom is incorrect?

a. It has a unit defined as a dalton.

b. On Earth, it equals the atomic weight.

c. Unlike the atomic weight of an atom, it does not change when gravitational forces change.

d. It equals the number of electrons in an atom.

e. It is the sum of the protons and neutrons in the atomic nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

The elements are made up one type of atoms which contain electrons, protons, and neutrons. The atoms contain a nucleus, which contains protons and neutrons in it. The electrons revolve around the nucleus in their orbital paths. The atomic number of an element is the total number of protons present in the nucleus.

Answer to Problem 1TYK

Correct answer:

It equals the number of electrons in an atom.

Explanation of Solution

Justification for the correct answer:

Option (d) is that it equals the number of electrons in an atom. The mass number is represented by the sum of protons and neutrons. It is taken so because the mass of a proton and a neutron is almost equal, which is 1.66×10−24 g and the mass of an electron is about 1800 times lesser than this. So, it is ignored. The mass number is not equal to the number of electrons in an atom. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is that its unit is Dalton. The mass of proton and neutron is given by a unit named Dalton (Da). So, it is an incorrect option.

Option (b) is that on earth, it equals its atomic weight. The atomic mass is called Atomic weight if the gravitational force is considered. The mass number equals atomic weight when it is affected by the Earth’s gravitational force. So, it is an incorrect option.

Option (c) is that unlike the atomic weight of an atom, it does not change when gravitational forces change. The weight changes with a change in gravitational force but the mass is not changed. So, it is an incorrect option.

Option (e) is that it is the sum of the protons and neutrons in the atomic nucleus. The atomic nucleus contains neutron and protons, whose summation gives the mass number. So, it is an incorrect option.

Hence, options (a), (b), (c) and (e) are incorrect.

Conclusion

Thus, it can be concluded that the mass number is independent of the number of electrons contained in an atom. It is equal to the sum of the number of protons and neutrons in the atomic nucleus.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Textbook Question

Chapter 2, Problem 1TYK

Which of the following statements about the mass number of an atom is incorrect?

a. It has a unit defined as a dalton.

b. On Earth, it equals the atomic weight.

c. Unlike the atomic weight of an atom, it does not change when gravitational forces change.

d. It equals the number of electrons in an atom.

e. It is the sum of the protons and neutrons in the atomic nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

The elements are made up one type of atoms which contain electrons, protons, and neutrons. The atoms contain a nucleus, which contains protons and neutrons in it. The electrons revolve around the nucleus in their orbital paths. The atomic number of an element is the total number of protons present in the nucleus.

Answer to Problem 1TYK

Correct answer:

It equals the number of electrons in an atom.

Explanation of Solution

Justification for the correct answer:

Option (d) is that it equals the number of electrons in an atom. The mass number is represented by the sum of protons and neutrons. It is taken so because the mass of a proton and a neutron is almost equal, which is 1.66×10−24 g and the mass of an electron is about 1800 times lesser than this. So, it is ignored. The mass number is not equal to the number of electrons in an atom. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is that its unit is Dalton. The mass of proton and neutron is given by a unit named Dalton (Da). So, it is an incorrect option.

Option (b) is that on earth, it equals its atomic weight. The atomic mass is called Atomic weight if the gravitational force is considered. The mass number equals atomic weight when it is affected by the Earth’s gravitational force. So, it is an incorrect option.

Option (c) is that unlike the atomic weight of an atom, it does not change when gravitational forces change. The weight changes with a change in gravitational force but the mass is not changed. So, it is an incorrect option.

Option (e) is that it is the sum of the protons and neutrons in the atomic nucleus. The atomic nucleus contains neutron and protons, whose summation gives the mass number. So, it is an incorrect option.

Hence, options (a), (b), (c) and (e) are incorrect.

Conclusion

Thus, it can be concluded that the mass number is independent of the number of electrons contained in an atom. It is equal to the sum of the number of protons and neutrons in the atomic nucleus.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 2, Problem 1TYK

Which of the following statements about the mass number of an atom is incorrect?

a. It has a unit defined as a dalton.

b. On Earth, it equals the atomic weight.

c. Unlike the atomic weight of an atom, it does not change when gravitational forces change.

d. It equals the number of electrons in an atom.

e. It is the sum of the protons and neutrons in the atomic nucleus.

Expert Solution & Answer

Summary Introduction

Introduction:

The elements are made up one type of atoms which contain electrons, protons, and neutrons. The atoms contain a nucleus, which contains protons and neutrons in it. The electrons revolve around the nucleus in their orbital paths. The atomic number of an element is the total number of protons present in the nucleus.

Answer to Problem 1TYK

Correct answer:

It equals the number of electrons in an atom.

Explanation of Solution

Justification for the correct answer:

Option (d) is that it equals the number of electrons in an atom. The mass number is represented by the sum of protons and neutrons. It is taken so because the mass of a proton and a neutron is almost equal, which is 1.66×10−24 g and the mass of an electron is about 1800 times lesser than this. So, it is ignored. The mass number is not equal to the number of electrons in an atom. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is that its unit is Dalton. The mass of proton and neutron is given by a unit named Dalton (Da). So, it is an incorrect option.

Option (b) is that on earth, it equals its atomic weight. The atomic mass is called Atomic weight if the gravitational force is considered. The mass number equals atomic weight when it is affected by the Earth’s gravitational force. So, it is an incorrect option.

Option (c) is that unlike the atomic weight of an atom, it does not change when gravitational forces change. The weight changes with a change in gravitational force but the mass is not changed. So, it is an incorrect option.

Option (e) is that it is the sum of the protons and neutrons in the atomic nucleus. The atomic nucleus contains neutron and protons, whose summation gives the mass number. So, it is an incorrect option.

Hence, options (a), (b), (c) and (e) are incorrect.

Conclusion

Thus, it can be concluded that the mass number is independent of the number of electrons contained in an atom. It is equal to the sum of the number of protons and neutrons in the atomic nucleus.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

Introduction:

The elements are made up one type of atoms which contain electrons, protons, and neutrons. The atoms contain a nucleus, which contains protons and neutrons in it. The electrons revolve around the nucleus in their orbital paths. The atomic number of an element is the total number of protons present in the nucleus.

Answer to Problem 1TYK

Correct answer:

It equals the number of electrons in an atom.

Explanation of Solution

Justification for the correct answer:

Option (d) is that it equals the number of electrons in an atom. The mass number is represented by the sum of protons and neutrons. It is taken so because the mass of a proton and a neutron is almost equal, which is 1.66×10−24 g and the mass of an electron is about 1800 times lesser than this. So, it is ignored. The mass number is not equal to the number of electrons in an atom. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is that its unit is Dalton. The mass of proton and neutron is given by a unit named Dalton (Da). So, it is an incorrect option.

Option (b) is that on earth, it equals its atomic weight. The atomic mass is called Atomic weight if the gravitational force is considered. The mass number equals atomic weight when it is affected by the Earth’s gravitational force. So, it is an incorrect option.

Option (c) is that unlike the atomic weight of an atom, it does not change when gravitational forces change. The weight changes with a change in gravitational force but the mass is not changed. So, it is an incorrect option.

Option (e) is that it is the sum of the protons and neutrons in the atomic nucleus. The atomic nucleus contains neutron and protons, whose summation gives the mass number. So, it is an incorrect option.

Hence, options (a), (b), (c) and (e) are incorrect.

Conclusion

Thus, it can be concluded that the mass number is independent of the number of electrons contained in an atom. It is equal to the sum of the number of protons and neutrons in the atomic nucleus.

Answer 8

Expert Solution & Answer

Summary Introduction

Introduction:

The elements are made up one type of atoms which contain electrons, protons, and neutrons. The atoms contain a nucleus, which contains protons and neutrons in it. The electrons revolve around the nucleus in their orbital paths. The atomic number of an element is the total number of protons present in the nucleus.

Answer to Problem 1TYK

Correct answer:

It equals the number of electrons in an atom.

Explanation of Solution

Justification for the correct answer:

Option (d) is that it equals the number of electrons in an atom. The mass number is represented by the sum of protons and neutrons. It is taken so because the mass of a proton and a neutron is almost equal, which is 1.66×10−24 g and the mass of an electron is about 1800 times lesser than this. So, it is ignored. The mass number is not equal to the number of electrons in an atom. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is that its unit is Dalton. The mass of proton and neutron is given by a unit named Dalton (Da). So, it is an incorrect option.

Option (b) is that on earth, it equals its atomic weight. The atomic mass is called Atomic weight if the gravitational force is considered. The mass number equals atomic weight when it is affected by the Earth’s gravitational force. So, it is an incorrect option.

Option (c) is that unlike the atomic weight of an atom, it does not change when gravitational forces change. The weight changes with a change in gravitational force but the mass is not changed. So, it is an incorrect option.

Option (e) is that it is the sum of the protons and neutrons in the atomic nucleus. The atomic nucleus contains neutron and protons, whose summation gives the mass number. So, it is an incorrect option.

Hence, options (a), (b), (c) and (e) are incorrect.

Conclusion

Thus, it can be concluded that the mass number is independent of the number of electrons contained in an atom. It is equal to the sum of the number of protons and neutrons in the atomic nucleus.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

Introduction:

The elements are made up one type of atoms which contain electrons, protons, and neutrons. The atoms contain a nucleus, which contains protons and neutrons in it. The electrons revolve around the nucleus in their orbital paths. The atomic number of an element is the total number of protons present in the nucleus.

Answer 12

Answer to Problem 1TYK

Correct answer:

It equals the number of electrons in an atom.

Answer 13

Explanation of Solution

Justification for the correct answer:

Option (d) is that it equals the number of electrons in an atom. The mass number is represented by the sum of protons and neutrons. It is taken so because the mass of a proton and a neutron is almost equal, which is 1.66×10−24 g and the mass of an electron is about 1800 times lesser than this. So, it is ignored. The mass number is not equal to the number of electrons in an atom. Hence, option (d) is correct.

Justification for the incorrect answers:

Option (a) is that its unit is Dalton. The mass of proton and neutron is given by a unit named Dalton (Da). So, it is an incorrect option.

Option (b) is that on earth, it equals its atomic weight. The atomic mass is called Atomic weight if the gravitational force is considered. The mass number equals atomic weight when it is affected by the Earth’s gravitational force. So, it is an incorrect option.

Option (c) is that unlike the atomic weight of an atom, it does not change when gravitational forces change. The weight changes with a change in gravitational force but the mass is not changed. So, it is an incorrect option.

Option (e) is that it is the sum of the protons and neutrons in the atomic nucleus. The atomic nucleus contains neutron and protons, whose summation gives the mass number. So, it is an incorrect option.

Hence, options (a), (b), (c) and (e) are incorrect.

Answer 14

Conclusion

Thus, it can be concluded that the mass number is independent of the number of electrons contained in an atom. It is equal to the sum of the number of protons and neutrons in the atomic nucleus.

Answer 15

Ch. 2.1 - Distinguish between an element and an atom, and...Ch. 2.2 - Prob. 1SB Ch. 2.2 - Prob. 2SB Ch. 2.2 - Prob. 3SB Ch. 2.3 - Prob. 1SB Ch. 2.3 - Prob. 2SB Ch. 2.3 - Prob. 3SB Ch. 2.3 - Prob. 4SB Ch. 2.4 - Prob. 1SB Ch. 2.4 - Prob. 2SB

Concept explainers

Videos

Answer to Problem 1TYK

Explanation of Solution

Want to see more full solutions like this?

Chapter 2 Solutions