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Atomic Structure and Key Experiments

Total questions: 100

Worksheet time: 2hrs 2mins

Name
Class
Date
1.

Which scientist was the first person responsible for proposing the idea of atoms?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

2.

Which scientist was the first person responsible for proposing the discovery of the electron?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

3.

Which scientist was the first person responsible for proposing the discovery of the nucleus?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

4.

Which scientist claimed that the atom was a small, dense, solid sphere?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

5.

Which scientist's model is referred to as the Plum Pudding Model?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

6.

Which scientist's model is referred to as the Planetary model?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

7.

Which scientist proposed the idea that the electrons orbited the nucleus on fixed paths with designated energies?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

8.

Which scientist proposed that the atom was indivisible using the word "atomos"?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

9.

Which model of the atom is the most up to date model?

a)

The Billiard Ball Model

b)

The Plum Pudding Model

c)

The Planetary Model

d)

The Wave Mechanical Model

e)

The Nuclear Model

10.

Which model of the atom describes the location of electrons as probable within a dense "cloud" surrounding the nucleus of an atom?

a)

The Billiard Ball Model

b)

The Plum Pudding Model

c)

The Planetary Model

d)

The Wave Mechanical Model

e)

The Nuclear Model

11.

Which scientist claimed that compounds consist of atoms in a fixed ratio?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

12.

Which scientist performed the Cathode Ray Experiment?

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

13.

Which scientist performed the Gold Foil Experiment??

a)

Democritus

b)

John Dalton

c)

Ernest Rutherford

d)

J.J. Thomson

e)

Niels Bohr

14.

Showed the atom was mostly empty space, and that the nucleus was small, dense, and positively charged.

a)

Rutherford

b)

Thomson

c)

Bohr

d)

Democritus

15.

The area of probability of finding an electron.

a)

Alpha

b)

Orbital

c)

Cathode

d)

Nucleus

16.

Who discovered that the atom had an small, dense, positively charged center?

a)

Ernest Rutherford

b)

J.J Thomson

c)

Robert Millikan

d)

John Dalton

17.
What can you conclude from the fact that scientists continue to update the atomic model?
a)
New information about atoms continues to be discovered
b)
Old information about atoms is completely useless
c)
Scientists did not have any information about atoms until a few years ago
d)
Scientists still have no idea what atoms look like
18.

Who named the positive center of the atom the "nucleus?"

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

19.

Which scientist discovered that the atom has parts - which means it can be divided?

a)

Democritus

b)

Dalton

c)

Thomson

d)

Rutherford

20.

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

a)

the nucleus

b)

the atom

c)

the electrons

d)

the positive material

21.

Which one of these is Dalton's Model?

a)
b)
c)
d)
22.

Which model was created after the discovery of the nucleus?

a)

Dalton's

b)

Rutherford's

c)

Quantum Mechanical

d)

Plum Pudding

23.

Which model was created after the discovery of the electron cloud?

a)

Dalton's

b)

Rutherford's

c)

Quantum Mechanical

d)

Plum Pudding

24.

Who used the Cathode Ray Tube Experiment to discover electrons?

a)

Rutherford

b)

Bohr

c)

J.J. Thomson

d)

Democritus

25.

Who was the first contributor to the atomic theory?

a)

John Dalton

b)

Ernest Rutherford

c)

JJ Thomson

d)

Democritus

e)

Neils Bohr

26.
Democritus believed that the smallest particles, were atomos, the Greek word for 
a)
small
b)
uncut or indivisible
c)
basic
27.
Who proposed that the atom consists mostly of empty space?
a)
Bohr
b)
Dalton
c)
Rutherford
d)
Chadwick
28.

What was Ernest Rutherford's contributions to atomic theory?

a)

Discovered the nucleus- did the gold foil experiment

b)

Used the cathode ray tube in his discovery

c)

Discovered the electron

d)

Discovered the neutron

29.
Which scientist saw the atom as a solid sphere?
a)
Dalton
b)
Thomson
c)
Rutherford
d)
Bohr
30.
Who's model is this?
a)
Thomson
b)
Rutherford
c)
Democritus
d)
Bohr
31.

What is Neils Bohr's contribution to the atomic theory?

a)

Created the atomic theory

b)

Created a model of the atom with electrons moving around the nucleus in a fixed orbits

c)

Discovered that the proton had a positive charge

d)

Believed that atoms of a given element are identical

e)

Discovered the electron

32.

What model is the current model of the atom?

a)

Rutherford's

b)

Bohr's

c)

The Quantum Mechanical Model

d)

Dalton's

33.
He found that atoms have smaller parts and found negative electrons that he theorized were surrounded in a sphere of positive charges
a)
J.J. Thomson
b)
Ernest Rutherford
c)
Niels Bohr
d)
James Chadwick
34.
Ernest Rutherford discovered that atoms were mostly _________________. 
a)
negatively charged
b)
positively charged
c)
electrons
d)
empty space. 
35.

Which scientist is credited with discovering the neutron?

a)

J.J. Thomson

b)

Ernest Rutherford

c)

Niels Bohr

d)

James Chadwick

36.

Who proposed that electrons move in specific energy levels around the nucleus?

a)

Bohr

b)

Rutherford

c)

Chadwick

d)

Dalton

37.

John Dalton said that all atoms of the same element are _________________.

a)

identical

b)

indestructible

c)

indifferent

d)

ironic

38.

What was the name given to John Dalton's atomic model?

a)

basketball

b)

billiard ball

c)

football

d)

cue ball

39.

What did Erwin Schrodinger do to help with atomic theory?

a)

He developed the Electron Cloud Model.

b)

Made the Bohr Model.

c)

Discovered the Protons.

d)

None of the Above.

40.

Millikan's oil drop experiment allowed this to be discovered...

a)

charge-to-mass​ ratio of electron

b)

Mass of the electron

c)

Velocity of an electron

d)

charge of an electron.

41.

According to Max Plank, a particle of light is called a photon.

a)
True
b)
False
42.

The diagram shows a cathode ray tube. Name the parts of cathode ray tube: 1-..............................and

2- .......................................... (write the answer in the singular)



(a)  

43.

The diagram shows a cathode ray tube. Name the parts of cathode ray tube: 3-................... ............and

4- .......................................... (write the answer in the singular.) .



(a)  

44.

The diagram shows a cathode ray tube. What is shown at number 5-.............................. .............................



(a)  

45.

Cathode rays are streams of (a)   observed in vacuum tubes

46.

The operation of CRT is based on ............................... ............................... .

(a)  

47.

Which of the following is not true for the cathode rays?

a)

They are deflected by magnetic field.

b)

They are positively charged.

c)

They cause mechanical motion.

d)

They produce heating effect.

e)

They travel in stright lines.

48.

At room temperature, the electron cannot escape metal surface due to

a)

attractive forces of nucleus

b)

repulsive forces of electrons

c)

repulsive forces of nucleus

d)

pulling force of protons

49.

If an electric field is put across the beam with the positive plate on top and the negative plate below.

The beam will bend ...............

a)

right

b)

left

c)

up

d)

down

50.

Why is a vacuum needed in the tube?

a)


It makes the process more efficient.

b)

It impedes or slows down the electrons.

c)


It allows the electrons to flow unimpeded.

d)


It allows the electrons to be made into a beam.

51.

How is the electron beam detected?

a)


Using an electron microscope.

b)


By deflecting the beam of electrons with an electric field.

c)

By deflecting the beam of electrons with a magnetic field.

d)


Use of a fluorescent screen.

52.

What happens when cathode rays strike the fluorescent screen ?

a)


electron bounces back

b)


nothing happens

c)


emit light

d)


produce current

53.

how to increase the rate of thermionic emission

a)


immerse metal in an electrolyte

b)


increase the surrounding pressure

c)


decrease the temperature of metal to stabilize electron

d)

increase the surface area of the metal

54.

What is the purpose of connecting anode with high voltage d.c power supply?

a)


to deflect or change the direction of the electron

b)


to accelerate the electron

c)


to deceleration the electron

d)


to increase the rate of thermionic emission

55.

Cathode rays carry ..........

a)


neutral particles

b)

electrons and protons

c)


negative charge

d)


positvie charge

56.

Which particle is cathode ray?

a)

Electron beam

b)

Gamma ray

c)

Neutron

d)

Alpha particles

57.

Thermionic emission is dependent on temperature.

a)

True

b)


False

58.

Which of the following is false with respect to thermionic emission.

a)

At ordinary temperatures, the free electrons of a metal do not have sufficient energy to come out.

.

b)

When a metal is heated to a high temperature, electrons escape from its surface.

c)

The electrons coming out are called as thermions.

d)

At ordinary temperatures, the free electrons of a metal have sufficient energy to come out.

59.

Who Discovered Electron?

a)

Robert Milikan

b)

J .J .Thomson

c)

Ernst Rutherford

60.

Choose the correct description of J. J. Thomson's Model of an Atom.

a)

The model is a indivisible and indestructible sphere

b)

The model is a sphere in which negatively charged particles - electrons- immersed in a positively charged space of the sphere.

c)

The model is a sphere in which negatively charged particles - electrons- move around the center of an atom creating an electron cloud

d)

The model is a sphere in which negatively charged particles - electrons - move around the nucleus of an atom in a defined passes, called orbits, like planets around the sun

61.

What is the name of J.J. Thomson's Model of an Atom?

a)

Jimmy Neutron Model

b)

Solar System Model

c)

Plum-Pudding Model

d)

Quantum mechanical Model

62.

Who was Ernset Rutherford?

a)

English Science teacher who developed the first Atomic Theory

b)

English physicist who discovered an electron

c)

German physicist who discovered a proton

d)

New Zealand born physicist who established existence of a positively charged nucleus in an atom

63.

Why did Ernest Rutherford and his colleagues perform the Gold-Foil Experiment?

a)

They wanted to test and confirm the Plum-Pudding model

b)

They wanted to test John Dalton's Model

c)

They were looking for electrons

d)

They wanted to come up with their own Atomic Model

64.

What is an alpha particle?

a)

It is a dominant particle in a subatomic world

b)

It is a particle that has 2+ charge

c)

It is a particle that has 2- charge

d)

It is a helium atom without a charge

65.

What results did Rutherford expect to see if the Plum-Pudding model is correct?

a)

He expected that most of alpha particles would go through a gold-foil and small number of particles would deflect sightly

b)

He expected that most of alpha particles would not go through a gold-foil and will stop on one side of a foil.

c)

He expected that most of alpha particles would ricochet back after hitting a gold-foil

66.

What results did Rutherford observe in his Gold-Foil experiment?

a)

He observed that all alpha particles did go through a gold-foil in straight lines

b)

He observed that most alpha particles did not go through a gold-foil and stopped on one side of the gold foil.

c)

He observed that a small number of alpha particles bounced off the gold-foil at very large angles

d)

He observed that all alpha particles slightly deflected from the straight line when going through a gold-foil

67.

Choose one of the conclusions that Ernest Rutherford made based on the experimental results of his Gold-Foil experiment

a)

He concluded that the atom is indivisible

b)

He concluded that the atom is mostly empty space

c)

He concluded that the atom has neutrons

d)

He concluded that the atom is tightly packed with subatomic particles all mixed together

68.

Choose one of the conclusions that Ernest Rutherford made about the mass of the atom, based on the experimental results of his Gold-Foil experiment

a)

He concluded that almost all mass of the atom is distributed evenly among subatomic particles

b)

He concluded that almost all mass of the atom is distributed among electrons

c)

He concluded that almost all mass of the atom is concentrated in a small region, in a center of an atom, that has a positive charge

d)

He concluded that almost all mass of the atom is concentrated in a small region, in a center of an atom, that has a negative charge

69.

Based on the experimental results of his Gold-Foil experiment, Ernest Rutherford concluded that

a)

The very dense center of the atom has a positive charge

b)

The very dense center of the atom has a negative charge

c)

The very dense center of the atom has no charge

d)

The atom doesn't have a center and all particles are distributed evenly like in a chocolate chip cookie

70.

What is the nucleus of the atom?

a)

It is a centra organel of a cell

b)

It is a center of a fruit

c)

It is a very dense cenral core of an atom that has a positive charge

d)

It is a very dense cenral core of an atom that has a negative charge

71.

What subatomic particles are in the nucleus of an atom?

a)

Only protons

b)

Protons and neutrons

c)

Only neutrons

d)

Only electrons

e)

Protons and electrons

72.

Based on Rutherford's model of the atom, electrons in the atom are located

a)

inside of the nucleus of the atom

b)

outside and around the nucleus of the atom

c)

outside and inside of the nucleus of the atom

73.

What is the average size of an atom?

a)

1 nm

b)

1 m

c)

1 0A

d)

1 pm

74.

If the atom has 25 electrons, how many protons does it need to have to be neutral?

a)

5 protons

b)

25 protons

c)

it doesn't need protons

d)

15 protons

75.

If one of the reagent of a chemical reaction is a piece of copper metal, what would happen with copper at the end of the reaction?

a)

Copper will transform into another metal, like gold

b)

Copper will stay copper but may combine with atoms of other elements in the reaction, forming a new substance

c)

Copper will not combine with atoms of other elements and we will be able to get it back by simple filtration

76.

The three main types of nuclear radiation are alpha, beta, and gamma. Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?

a)

alpha, gamma, beta

b)

beta, alpha, gamma

c)

beta, gamma, alpha

d)

gamma, beta, alpha

77.

Which equation correctly represents the alpha decay of polonium-214?

a)

A

b)

B

c)

C

d)

D

78.

This equation shows the radioactive decay of thorium (Th). Which of the following particles is released in this reaction?

a)

alpha

b)

beta

c)

neutron

d)

gamma

79.
What particle completes this reaction?
a)
alpha particle
b)
beta particle
c)
gamma particle
d)
neutron
80.
Complete the nuclear equation and determine the type of decay that is occurring in this reaction. 
a)
alpha
b)
beta
c)
gamma
d)
none
81.
Solve this equation for alpha decay.
20985At = ___ + 42He
a)
20583Bi
b)
20986Rn
c)
20781Tl
d)
20885At
82.
Solve this equation for beta decay.
6027Co = ___ + 0-1e
a)
5625Mn
b)
6028Ni
c)
5823V
d)
5927Co
83.
If we start off with element 5024X after an alpha decay we get another element Y that looks like
a)
5022Y
b)
4622Y
c)
4820Y
d)
5426Y
84.
What is the missing isotope that will balance the following nuclear equation?
94Be  +  11H →  _____  +  42He
a)
105B
b)
105Ne
c)
63Li
d)
63C
85.

Complete the nuclear reaction

a)

42He

b)

0-1 e

c)

00Y

d)

178O

86.
A helium nucleus with two protons and two neutrons is called a(n) ____.  
a)
alpha particle
b)
electroscope
c)
beta particle
d)
gamma ray
87.
Negatively charged particles emitted from a nucleus at a high speed are ____.  
a)
alpha particle
b)
gamma rays
c)
beta particles
d)
X rays
88.
When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element....
a)
remains the same
b)
  decreases by one.
c)
increases by one.
d)
increases by two.
89.
Radioactive materials have unstable...
a)
electrons
b)
protons
c)
nuclei
d)
neutrons
90.
What is the product of the alpha decay of Gold-175?
a)
Ir-171
b)
Tl-179
c)
Au179
d)
Au171
91.
What happens to the atomic number during alpha decay?
a)
The atomic number decreases by 4
b)
The atomic number increases by 1
c)
The atomic number decreases by 2.
d)
The atomic number stays the same.
92.

What does the 4 in He-4 represent?

a)

the mass number

b)

the atomic number

c)

the number of protons

d)

the number of neutrons

93.

Np-239 emits a beta particle. What element is the other product?

a)

Th-239

b)

U-239

c)

Pu-239

d)

Pu-238

94.

The spontaneous disintegration of a nucleus into a slightly lighter and more stable nucleus, accompanied by emission of particles, electromagnetic radiation, or both, is

a)

nuclear fusion

b)

nuclear fission

c)

radioactive decay

d)

nuclear decay

95.
What element is the ?
a)
Ag-115
b)
Cd-115
c)
Pd-115
d)
Not Listed
96.
If Gadolinium-150 goes through alpha decay, the resulting element has a new atomic mass of _____.
a)
150
b)
148
c)
146
97.

In the symbol 20682Pb what does 82 stand for?

a)

Mass number

b)

Atomic number

c)

Atomic mass

d)

Number of protons

98.
If Thorium-234 undergoes a beta decay, What element will be left in its place?
a)
Actinium-234
b)
Thorium-233
c)
Protactinium-234
d)
Radium-230
99.
If a sample decays via beta radiation how does its mass change?  
a)
4
b)
2
c)
1
d)
0
100.

What is false of the penetrance of different types of radiation?

a)

Alpha blocked by paper

b)

Beta blocked by aluminum

c)

Beta blocked by paper

d)

Gamma blocked by lead

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