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Atomic Theory and Discoveries Quiz

Total questions: 106

Worksheet time: 9hrs 50mins

Name
Class
Date
1.

Who was the first to name the atom?

a)

John Dalton

b)

Dmitri Mendeleev

c)

Democritus

d)

JJ Thomson

2.

What did John Dalton propose about atoms in 1803?

a)

Atoms are divisible

b)

Atoms are solid spheres that can't get any smaller

c)

Atoms are positively charged spheres

d)

Atoms have a nucleus

3.

Who developed the first periodic table of elements?

a)

Ernest Rutherford

b)

Henry Moseley

c)

Dmitri Mendeleev

d)

JJ Thomson

4.

What is the key feature of JJ Thomson's Plum Pudding Model?

a)

Atoms are indivisible

b)

Atoms have a nucleus

c)

Atoms are positively charged spheres with negative particles embedded

d)

Atoms are solid spheres

5.

What experiment did Ernest Rutherford conduct to develop his nuclear model?

a)

Gold foil experiment

b)

Oil drop experiment

c)

Cathode ray experiment

d)

Double-slit experiment

6.

What did Henry Moseley discover about elements?

a)

Elements are made of solid spheres

b)

The number of protons is unique to each element

c)

Atoms are indivisible

d)

Elements are organized by atomic mass

7.

What is the charge of electrons according to the Niels Bohr Model?

a)

Positive

b)

Negative

c)

Neutral

d)

No charge

8.

According to the Schrodinger and Heisenberg Electron Cloud model, how do electrons behave?

a)

Travel in fixed orbits

b)

Remain stationary

c)

Surround the nucleus in an electron cloud that is divided into shells

d)

Move randomly without any pattern

9.

What is the nucleus of an atom made of?

a)

Electrons and protons

b)

Neutrons and electrons

c)

Protons and neutrons

d)

Only protons

10.

Where is the mass of the atom primarily located?

a)

Electron cloud

b)

Nucleus

c)

Outer shell

d)

Energy levels

11.

What is the charge of the electron cloud?

a)

Positive

b)

Negative

c)

Neutral

d)

No charge

12.

What is the charge of a proton?

a)

Positive

b)

Negative

c)

Neutral

d)

No charge

13.

Where are electrons located in an atom?

a)

Inside the nucleus

b)

In the electron cloud

c)

With the protons

d)

In the neutron cloud

14.

What type of force holds the atom together?

a)

Repulsive force between protons

b)

Attractive force between the nucleus and electron cloud

c)

Repulsive force between neutrons

d)

Attractive force between electrons

15.

What is the role of quarks in an atom?

a)

They make up electrons

b)

They are the smallest known particle and make up protons and neutrons

c)

They make up the electron cloud

d)

They make up the nucleus

16.

This subatomic particle is what gives the nucleus an overall positive charge.

a)

Neutrons

b)

Electrons

c)

Protons

d)

Quarks

17.

This is the space surrounding the nucleus that has an overall negative charge.

a)

Nucleus

b)

Electron cloud

c)

Valence electrons

d)

Shells

18.

The smallest particle of an element that still has the element’s properties.

a)

Atom

b)

Proton

c)

Neutron

d)

Electron

19.

Located in the outermost energy level of the electron cloud, with the most energy.

a)

Neutrons

b)

Protons

c)

Valence electrons

d)

Quarks

20.

This subatomic particle contributes to the overall mass of an atom, but not its charge.

a)

Electrons

b)

Protons

c)

Neutrons

d)

Valence electrons

21.

The dense center of an atom.

a)

Electron cloud

b)

Nucleus

c)

Shells

d)

Valence electrons

22.

The smallest known particles that make up both protons and neutrons.

a)

Electrons

b)

Quarks

c)

Atoms

d)

Shells

23.

Also known as energy levels, these break up the region of space surrounding the nucleus.

a)

Nucleus

b)

Electron cloud

c)

Shells

d)

Valence electrons

24.

The subatomic particle located in the space surrounding the nucleus.

a)

Protons

b)

Neutrons

c)

Electrons

d)

Quarks

25.

Which subatomic particle is located in the nucleus and has a positive charge?

a)

Electron

b)

Neutron

c)

Proton

d)

Quark

26.

Which subatomic particle is located in the nucleus and has a neutral charge?

a)

Electron

b)

Neutron

c)

Proton

d)

Quark

27.

Which subatomic particle is located in the electron cloud and has a negative charge?

a)

Electron

b)

Neutron

c)

Proton

d)

Quark

28.

Describe what makes up the compound CO₂.

a)

CO₂ is 2 atoms of the element carbon and 1 atom of the element oxygen

b)

CO₂ is 1 atom of the element carbon and 2 atoms of the element oxygen

c)

CO₂ is 1 atom of the element oxygen and 2 atoms of the element carbon

d)

CO₂ is 2 atoms of the element oxygen and 2 atom of the element carbon

29.

What does the atomic number of an element tell you?

a)

The number of neutrons in an atom

b)

The number of protons in an atom

c)

The mass number of an atom

d)

The number of electrons in an atom

30.

Who is credited with arranging the periodic table by atomic number?

a)

Dmitri Mendeleev

b)

Albert Einstein

c)

Henry Moseley

d)

Niels Bohr

31.

What does the mass number of an atom represent?

a)

The number of protons only

b)

The number of electrons only

c)

The number of protons and neutrons

d)

The number of neutrons only

32.

What is the symbol for Hydrogen?

a)

He

b)

H

c)

Hy

d)

Hg

33.

What is the atomic number of Aluminum (Al)?

a)

25

b)

13

c)

47

d)

11

34.

How many neutrons does an isotope of an element with a mass number of 109 and an atomic number of 47 have?

a)

47

b)

62

c)

109

d)

21

35.

Which of the following is not an example of isotopes?

a)

Hydrogen-1 vs. Helium-4

b)

Hydrogen-1 vs. Hydrogen-2

c)

Oxygen-16 vs. Oxygen-18

d)

Carbon-12 vs. Carbon-14

36.

In hyphen notation, how would you represent an atom of potassium with a mass number of 40?

a)

Potassium-19

b)

Potassium-40

c)

40K

d)

K-19

37.

What is the most stable condition for an atom in terms of protons and neutrons?

a)

When the number of protons is greater than neutrons

b)

When the number of neutrons is greater than protons

c)

When the number of protons and neutrons are the same

d)

When the number of electrons is greater than protons

38.

What is the hyphen form of Boron with an atomic mass of 11?

a)

Boron-10

b)

Boron-11

c)

Boron-12

d)

Boron-13

39.

What is the nuclear form of Sodium with an atomic mass of 23?

a)

²²Na

b)

²³Na

c)

²⁴Na

d)

²⁵Na

40.

What is the average atomic mass of Hydrogen?

a)

1.00

b)

1.01

c)

1.10

d)

1.11

41.

What is the most common version of hydrogen in nature?

a)

Hydrogen-2

b)

Hydrogen-1

c)

Hydrogen-3

d)

Hydrogen-4

42.

What element did you draw if the atom has 4 protons?

a)

Carbon

b)

Oxygen

c)

Beryllium

d)

Helium

43.

How do you know the number of protons in an atom?

a)

By the mass number

b)

By the atomic number

c)

By the number of electrons

d)

By the number of neutrons

44.

How do you calculate the number of neutrons in an atom?

a)

Atomic number - Mass number

b)

Mass number - Atomic number

c)

Number of electrons - Atomic number

d)

Mass number + Atomic number

45.

How do you know the number of electrons in an atom if it is electrically neutral?

a)

Same as the number of neutrons

b)

Same as the mass number

c)

Same as the number of protons

d)

Same as the atomic mass

46.

Different versions of the same element are known as ______.

a)

isotopes

b)

ions

c)

molecules

d)

compounds

47.

In the isotopes Carbon-12, Carbon-13, and Carbon-14, the numbers 12, 13, and 14 refer to the ______.

a)

mass numbers

b)

atomic numbers

c)

electron numbers

d)

neutron numbers

48.

What subatomic particle makes each of these isotopes different?

a)

protons

b)

electrons

c)

neutrons

d)

quarks

49.

What subatomic particle makes each of these isotopes the same?

a)

protons

b)

neutrons

c)

electrons

d)

positrons

50.

This form of notation, 24K is known as ______.

a)

nuclear form

b)

chemical form

c)

molecular form

d)

atomic form

51.

The other form of isotope notation Potassium-25 is known as ______.

a)

hyphen form

b)

nuclear form

c)

atomic form

d)

elemental form

52.

What is the atomic number of Sodium-24?

a)

11

b)

24

c)

13

d)

12

53.

How many neutrons are present in Calcium-44?

a)

20

b)

24

c)

44

d)

22

54.

What is the mass number of Uranium-238?

a)

92

b)

238

c)

146

d)

129

55.

Which isotope has an atomic number of 53?

a)

Iodine-127

b)

Zinc-64

c)

Lead-207

d)

Fluorine-19

56.

What is the difference between mass number and average atomic mass?

a)

Mass number is the sum of protons and neutrons; average atomic mass is a weighted average of all isotopes.

b)

Mass number is the sum of electrons and neutrons; average atomic mass is the sum of protons and electrons.

c)

Mass number is the sum of protons and electrons; average atomic mass is the sum of neutrons and electrons.

d)

Mass number is the sum of protons and neutrons; average atomic mass is the sum of protons and neutrons.

57.

Which term indicates the most common version of an element?

a)

Mass number

b)

Atomic number

c)

Average atomic mass

d)

Isotope symbol

58.

What is the main purpose of the Periodic Table?

a)

To organize elements by their color

b)

To organize elements by their atomic number and chemical properties

c)

To organize elements by their size

d)

To organize elements by their weight

59.

Which group in the Periodic Table contains the most reactive metals?

a)

Group 2: Alkaline earth metals

b)

Group 3: Rare earth metals

c)

Group 1: Alkali metals

d)

Group 18: Noble gases

60.

How many valence electrons do elements in Group 18 typically have?

a)

1

b)

2

c)

3

d)

8

61.

Which group is known for being nonreactive due to chemical stability?

a)

Group 1: Alkali metals

b)

Group 17: Halogens

c)

Group 18: Noble gases

d)

Group 2: Alkaline earth metals

62.

What is a characteristic of elements in the same group on the Periodic Table?

a)

They have the same atomic number

b)

They have the same number of valence electrons

c)

They have the same atomic mass

d)

They have the same color

63.

What is the maximum number of electrons that Level 1 of an electron cloud can hold?

a)

2

b)

8

c)

18

d)

10

64.

Which group does Magnesium belong to on the periodic table?

a)

Group 1

b)

Group 2

c)

Group 3

d)

Group 4

65.

How many valence electrons does Magnesium have?

a)

1

b)

2

c)

3

d)

4

66.

What are the characteristics of metals?

a)

Shiny, silvery solids; good conductors of heat and electricity

b)

Dull, brittle solids; poor conductors

c)

Gases; poor conductors

d)

Located on the right of the metalloids

67.

Where are nonmetals located on the periodic table?

a)

Left of the metalloids

b)

Right of the metalloids

c)

In the center of the periodic table

d)

Below the metalloids

68.

What are metalloids known for?

a)

Being good conductors of electricity

b)

Having properties of both metals and nonmetals

c)

Being completely non-reactive

d)

Being gases at room temperature

69.

In a Bohr model, where are the protons and neutrons placed?

a)

In the electron cloud

b)

In the outer shell

c)

In the nucleus

d)

In the energy levels

70.

How do you determine the number of protons in an atom using the periodic table?

a)

By the element's atomic mass

b)

By the element's atomic number

c)

By the element's group number

d)

By the element's period number

71.

What is the purpose of using the period number on the periodic table in a Bohr model?

a)

To determine the number of protons

b)

To determine the number of neutrons

c)

To determine the number of energy levels

d)

To determine the number of valence electrons

72.

What element has the symbol Au?

a)

Gold

b)

Silver

c)

Aluminum

d)

Argon

73.

Which is the most reactive nonmetal?

a)

Fluorine

b)

Oxygen

c)

Nitrogen

d)

Helium

74.

What element has an atomic number of 12?

a)

Magnesium

b)

Sodium

c)

Calcium

d)

Potassium

75.

Which alkali metal is in period 4?

a)

Potassium

b)

Sodium

c)

Lithium

d)

Rubidium

76.

What is the most abundant element in air with an atomic number of 7?

a)

Nitrogen

b)

Oxygen

c)

Carbon

d)

Hydrogen

77.

Which metal with 3 valence electrons is used in cans?

a)

Aluminum

b)

Tin

c)

Iron

d)

Copper

78.

Which period 3 element will not react naturally?

a)

Argon

b)

Neon

c)

Helium

d)

Krypton

79.

What element has 5 valence electrons and is in period 3?

a)

Phosphorus

b)

Nitrogen

c)

Arsenic

d)

Antimony

80.

Which is the most reactive metal?

a)

Francium

b)

Lithium

c)

Sodium

d)

Potassium

81.

What period 1 element is used to make balloons float?

a)

Helium

b)

Hydrogen

c)

Neon

d)

Argon

82.

What is the only nonmetal in group 1?

a)

Hydrogen

b)

Helium

c)

Lithium

d)

Beryllium

83.

Which element is responsible for the smell of rotten eggs and has 16 protons?

a)

Sulfur

b)

Oxygen

c)

Nitrogen

d)

Phosphorus

84.

Which element has an atomic number that doubles silicon’s?

a)

Nickel

b)

Iron

c)

Cobalt

d)

Zinc

85.

What is the first element in the group of rare earth metals?

a)

Scandium

b)

Yttrium

c)

Lanthanum

d)

Cerium

86.

Which group 12 metal was once used in thermometers but is now known to be poisonous?

a)

Mercury

b)

Zinc

c)

Cadmium

d)

Lead

87.

Which element has 3 valence electrons and 4 energy levels?

a)

Gallium

b)

Aluminum

c)

Indium

d)

Thallium

88.

What is the only metalloid in period 3?

a)

Silicon

b)

Boron

c)

Germanium

d)

Arsenic

89.

Which is the only metalloid with 3 valence electrons?

a)

Boron

b)

Silicon

c)

Arsenic

d)

Antimony

90.

Which alkali metal makes up table salt?

a)

Sodium

b)

Potassium

c)

Lithium

d)

Rubidium

91.

Which element's most common isotope has 5 neutrons?

a)

Beryllium

b)

Boron

c)

Carbon

d)

Nitrogen

92.

The mass on the periodic table is known as the:

a)

Atom

b)

Electrons

c)

Average atomic mass

d)

Mass number

93.

Region surrounding the nucleus where electrons are found is called the:

a)

Nucleus

b)

Electron cloud

c)

Valence electrons

d)

Group

94.

The positively charged center of an atom is the:

a)

Proton

b)

Electron cloud

c)

Nucleus

d)

Quark

95.

Particles that differ in number between isotopes are:

a)

Protons

b)

Electrons

c)

Neutrons

d)

Quarks

96.

A vertical column in the periodic table is known as a:

a)

Period

b)

Group

c)

Valence electrons

d)

Isotopes

97.

Positively charged particles in an atom are called:

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

98.

Negatively charged particles in the outermost energy levels of the electron cloud are:

a)

Protons

b)

Neutrons

c)

Valence electrons

d)

Quarks

99.

The table that organizes the elements by properties is the:

a)

Atom

b)

Periodic Table

c)

Group

d)

Period

100.

Atoms of the same element that have different masses are called:

a)

Isotopes

b)

Quarks

c)

Neutrons

d)

Electrons

101.

Which group on the periodic table contains the most reactive metals?

a)

Alkali metals

b)

Alkaline earth metals

c)

Rare earth metals

d)

Transition metals

102.

Which group on the periodic table contains the most reactive nonmetals?

a)

Carbon group

b)

Nitrogen group

c)

Halogens

d)

Noble Gasses

103.

Which group on the periodic table is the least reactive?

a)

Alkali metals

b)

Transition metals

c)

Halogents

d)

Noble Gasses

104.

Common properties of metals include........

a)

shiny, silvery, solids, good conductors

b)

gasses, dull brittle solids, poor conductors

c)

solids, semi-conductors

d)

gasses, shiny, good conductors

105.

Common properties of metalloids include........

a)

shiny, silvery, solids, good conductors

b)

gasses, dull brittle solids, poor conductors

c)

solids, semi-conductors

d)

gasses, shiny, good conductors

106.

Common properties of non metals include........

a)

shiny, silvery, solids, good conductors

b)

gasses, dull brittle solids, poor conductors

c)

solids, semi-conductors

d)

gasses, shiny, good conductors

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