Atomic Theory 2

Question 1

Using electromagnetic ray theory, J.J. Thomson build a

Answer 1

Cathode Ray Tube

Question 2

The Cathode Ray Tube was used to prove that

Answer 2

Negatively charged particles (electrons) were present in atoms

Question 3

A cathode ray tube is a _ in which most of the air has been removed

Answer 3

Closed glass cylinder

Question 4

In the cathode ray tube are two

Answer 4

Electrodes

Question 5

The two electrodes in the cathode ray tube are called (2)

Answer 5

Cathode

Anode

Question 6

Cathode is

Answer 6

Negatively charged electrode

Question 7

Anode is

Answer 7

A positively charged electrode

Question 8

A _ is an example of a cathode ray tube

Answer 8

Neon sign

Question 9

When a high voltage is applied between the electrodes in a cathode ray tube

Answer 9

A beam of electrons travels from the anode to the cathode

Question 10

With the cathode ray tube, Thomson was able to determine the ratio of

Answer 10

Electric charge to the mass of a single electron

Question 11

Thomson believed that atoms looked like

Answer 11

A bowl of plum pudding

Question 12

Looked like a bowl of plum pudding because

Answer 12

Electrons sat in a pudding of protons

Question 13

In the pudding model, negative charges of electrons were

Answer 13

Canceled out by positive charges of protons

Question 14

Ernest Rutherford was a British

Answer 14

Physicist

Question 15

Ernest Rutherford took Thomson’s idea a step further by using

Answer 15

Radioactive particles

Question 16

Positively charged alpha particles are

Answer 16

Particles made up of two protons and two neutrons

Question 17

Rutherford shot positively charged alpha particles through a piece of gold foil

Question 18

When Ernest Rutherford shot the alpha particles through the foil, he noticed that

Answer 18

Some of the particles went straight through the foil

Question 19

When Ernest Rutherford shot the alpha particles through the foil, he noticed that some of the particles

Answer 19

Bounced back

Question 20

Why most particles went through the foil

Answer 20

Atoms are made up of mostly empty space

Question 21

Why some of the positively charged particles bounced back

Answer 21

Atoms have positively charged centers

Question 22

Like repels like AKA

Answer 22

Positive charges repel positive charges

Question 23

Ernest theorized because like repels like, the positively charged alpha particles were most likely

Answer 23

Hitting the center of the atom

Question 24

Ernest Rutherford named the center of the atom

Answer 24

The nucleus

Question 25

Nucleus contains nearly all

Answer 25

Of atoms mass