1.7 Recall the meaning of the term mass number of an atom • Mass (nucleon) Number = number of protons + neutrons

Question 1

What is the mass number of an atom?

Answer 1

The mass number is the total number of protons and neutrons in an atom’s nucleus.

Question 2

True or False: The mass number is equal to the number of protons only.

Answer 2

False

Question 3

Fill in the blank: The mass number is also known as the ______ number.

Answer 3

nucleon

Question 4

What does a higher mass number indicate about an atom?

Answer 4

It indicates that the atom has more nucleons (protons and neutrons).

Question 5

Which subatomic particle contributes to the mass number?

Answer 5

Both protons and neutrons contribute to the mass number.

Question 6

Multiple Choice: The mass number of an atom is represented by which symbol?

Answer 6

A

Question 7

What is the mass number of an atom with 6 protons and 6 neutrons?

Answer 7

12

Question 8

True or False: The mass number can be a fractional value.

Answer 8

False

Question 9

Fill in the blank: An atom with 8 protons and 10 neutrons has a mass number of ______.

Answer 9

18

Question 10

What is the relationship between mass number and atomic number?

Answer 10

The atomic number is the number of protons, while the mass number is the sum of protons and neutrons.

Question 11

Multiple Choice: Which of the following has a mass number of 14? A) Carbon-12 B) Carbon-14 C) Carbon-16

Answer 11

B) Carbon-14

Question 12

What is the mass number of an oxygen atom with 8 protons and 8 neutrons?

Answer 12

16

Question 13

True or False: Isotopes of an element have the same mass number.

Answer 13

False

Question 14

Fill in the blank: The mass number of an isotope is the same as the number of ______ plus the number of ______.

Answer 14

protons; neutrons

Question 15

What do you call atoms of the same element with different mass numbers?

Answer 15

Isotopes

Question 16

Multiple Choice: If an atom has 15 protons and 16 neutrons, what is its mass number? A) 15 B) 31 C) 16

Answer 16

B) 31

Question 17

True or False: Mass number affects the chemical properties of an element.

Answer 17

False

Question 18

What is the mass number of a hydrogen atom with 1 proton and no neutrons?

Answer 18

1

Question 19

Fill in the blank: The mass number is always a ______ number.

Answer 19

whole

Question 20

Multiple Choice: Which particle has no contribution to the mass number? A) Proton B) Neutron C) Electron

Answer 20

C) Electron

Question 21

What is the mass number of an atom with 20 protons and 22 neutrons?

Answer 21

42

Question 22

True or False: The mass number is used to determine the stability of an isotope.

Answer 22

True

Question 23

Fill in the blank: The mass number is calculated by adding the number of ______ and ______.

Answer 23

protons; neutrons

Question 24

Multiple Choice: An atom with a mass number of 23 and 11 protons must have how many neutrons? A) 12 B) 13 C) 14

Answer 24

B) 12

Question 25

What is the mass number of a carbon atom with 6 protons and 8 neutrons?

Answer 25

14