Chapter 2

Question 1

What are atoms made up of?

Answer 1

Protons, Neutrons, Electrons

Question 2

What is a nucleus?

Answer 2

Protons, and neutrons tightly bound together to form the central portion of an atom

Question 3

Where are electrons located?

Answer 3

Located outside the nucleus

Question 4

What is the mass number of an atom?

Answer 4

Equal to the sum of the number of protons and neutrons in the nucleus of an atom

Question 5

What is the atomic number of an atom?

Answer 5

Equal to the number of protons in the nucleus which is equal to the number of electrons in an neutral atom

Question 6

What are isotopes?

Answer 6

Atoms that have the same number of protons in the nucleus but different numbers of neutrons

Same atomic number, but different mass numbers

Same bottom, but different top

Question 7

What is the Atomic Mass Unit?

Answer 7

u

Question 8

What is the Atomic Mass Unit used for?

Answer 8

To express the relative masses of atoms