Chapter 3.2

Question 1

Experiments with cathode rays being deflected by a magnetic field show that cathode rays are composed of particles that are

Answer 1

Negatively charged

Question 2

Cathode rays are composed of particles that are know known as

Answer 2

Electrons

Question 3

In 1911, Ernest Rutherford conducted his now famous goldfoil experiment. During the experiment, alpha particles bombarded a thin piece of gold foil. The alpha particles were expected to pass easily through the gold foil. Every now and then, however, an alpha particle bounced back—an unexpected result. Rutherford concluded that these particles were striking

Answer 3

A tiny region of positive charge

Question 4

Rutherford called the region that deflected alpha particles

Answer 4

A nucleus

Question 5

The total volume of the nucleus of an atom is

Answer 5

Very small compared with the rest of the atom

Question 6

Except for in the simplest type of hydrogen atom, all nuclei consist of

Answer 6

Protons and neutrons

Question 7

Electrons can be found

Answer 7

Moving rapidly outside the nucleus

Question 8

We know that objects with like electric charge repel one another.
Why can protons remain close to one another in a nucleus?

Answer 8

A short-range force, called the strong nuclear force, binds protons together

Question 9

Most of an atom is

Answer 9

Empty

Question 10

What is the charge of a neutron

Answer 10

No charge

Question 11

Atom

Answer 11

The smallest particle of an element that retains the chemical properties of the element

Question 12

Nuclear Forces

Answer 12

Short range proton-proton, neutron neutron, and proton-neutron forces