Chapter 4:2 structure of the nuclear atom

Question 1

Who discovered the electrons in 1897?

Answer 1

JJ Thomson

Question 2

What has a negative charge?

Answer 2

Electrons

Question 3

What are glass tubes fitted at both ends with metal disks?

Answer 3

Electrodes

Question 4

What electrode became positively charged?

Answer 4

The anode

Question 5

What electrode had a negative charge?

Answer 5

The cathode which resulted in the cathode ray “Cathode Ray Tube” -Jj Thomson discovering electrons

Question 6

What is a stream of tiny, negatively charged particles moving at high-speed.

Answer 6

Electrons

Question 7

What did Jj Thomson discover about electrons?

Answer 7

Charged to mass

Question 8

What did Thomson conclude?

Answer 8

Electrons are a component in every atom

Question 9

Who was the US physicist that carried out experiments to find the quanity of an electron charge?

Answer 9

Robert A. Millikan

Question 10

Who did the oil-drop experiment?

Answer 10

Millikan

Question 11

What is accepted from Millikan today?

Answer 11

Values for electron charge and mass

Question 12

What has one unit of negative charge?

Answer 12

An electron

Question 13

Do atoms have an electrical charge?

Answer 13

No they’re neutral

Question 14

What’s the lightest atom?

Answer 14

Hydrogen

Question 15

What are electrical charges Carried by?

Answer 15

Particles of matter

Question 16

Do electrical charging always exist in whole number multiples of a single basic unit?

Answer 16

Yes

Question 17

Protons and electrons are equal then an electrically neutral particle is formed? True or false

Answer 17

True

Question 18

Who discovered a positively charged particle in 1886?

Answer 18

Eugen goldstien

Question 19

What is another name for canal rays?

Answer 19

Protons

Question 20

What did James Chadwick in 1932 discover?

Answer 20

Neutrons

Question 21

What are smaller than subatomic particles?

Answer 21

Quarks

Question 22

What is one important change to daltons theory?

Answer 22

Atoms are now known to be divisible

Question 23

True or false? Most scientists thought it was likely electrons were evenly spread through the an atom?

Answer 23

True

Question 24

What was thomsons model called?

Answer 24

Plum pudding model

Question 25

Who made thomsons model short lived?

Answer 25

Ernest Rutherford

Question 26

Where was Rutherford born?

Answer 26

New Zealand

Question 27

In 1911 what experiment occurred by Rutherford?

Answer 27

Gold-foil

Question 28

What were used in the foil experiment?

Answer 28

Alpha particles

Question 29

What happened to some alpha particles?

Answer 29

Bounced off gold at large angles

Question 30

Who said the atom is mostly empty space?

Answer 30

Rutherford

Question 31

Is the atom a mostly positive charge will all the mass in a small region of negative charge to deflect the alpha particles?

Answer 31

No, a small region will a POSITIVE charge

Question 32

What is the core of the atom?

Answer 32

The nucleus

Question 33

What is the Nucleus composed off?

Answer 33

Protons and neutrons

Question 34

What is Rutherfords model referred to as?

Answer 34

Nuclear atom

Question 35

What charge does the nucleus have?

Answer 35

Positive

Question 36

Is the nucleus large and not dense or tiny and densely packed?

Answer 36

Tiny and densely packed

Question 37

What happened in 1803?

Answer 37

Daltons atomic theory: Solid atom No parts Homogeneous

Question 38

What happened in 1897?

Answer 38

``` JJ Thomson discovers electrons: Cathode Ray Tube "plum pudding model" Positively charged cloud Charge to mass ratio ```

Question 39

What happened 1911?

Answer 39

Rutherford discovered nucleus: | Gold foil experiment

Question 40

What happened in 1917?

Answer 40

Robert Millikan used oil drop experiment to prove electrons

Question 41

What happened in 1932?

Answer 41

Neutrons discovered by James Chadwick

Question 42

What are atomic masses measured in?

Answer 42

Grams