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Unit 2 Review - Structure of an atom and periodic table

Total questions: 67

Worksheet time: 48mins

Name
Class
Date
1.

2 rows beneath the main periodic table

a)

Lanthanide

b)

Lanthanide and Actinide

c)

Lanthanide and Hydrogen

d)

Actinide and Hydrogen

2.

As of 2025, how many elements are there?

a)

100

b)

110

c)

115

d)

118

3.

How are the elements arranged on the periodic table today?

a)

By atomic mass

b)

By number of electrons

c)

By atomic number

d)

By alphabetic order

4.
How did Mendeleev arrange the elements?
a)

by alphabetical 

b)

by density

c)

by melting point

d)

by atomic mass

5.

 In the modern periodic table elements are arranged by:

a)

atomic mass

b)

valence electrons

c)

atomic number

d)

number of isotopes

6.

  Why were there blank spaces left in Mendeleev's periodic table?                                             

a)

 He didn't know what to put there.

b)

  Undiscovered elements not yet known.

c)

Multiple elements could have fit

d)

He forgot to add the elements in

7.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
8.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
9.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
10.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
11.

What is a valence electron?

a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
12.

one or two letters that represent the name of an element

a)

element name

b)

element symbol

c)

atomic number

d)

atomic mass

13.
The horizontal row on the periodic table is called a
a)
group
b)
family
c)
period
d)
atomic number
14.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)

mass number

15.

What does the 6 represent?

a)

atomic mass

b)

atomic number

c)

element name

d)

chemical symbol

16.

What does the C represent?

a)

atomic mass

b)

atomic number

c)

element name

d)

element symbol

17.

What does 12.011 represent?

a)

atomic mass

b)

atomic number

c)

mass number

d)

chemical symbol

18.

The letter, C, is a .................. of carbon.

a)

Name

b)

Nickname

c)

element Symbol

d)

Pseudonym

19.

Which group of the periodic table is composed of inert (not reactive) gases?

answer choices

a)

alkali metals

b)

alkaline earth metals

c)

halogens

d)

noble gases

20.

Which is an alkali metal?

a)

Magnesium

b)

Iron

c)

Sodium

d)

Europium

21.

Which is a halogen?

a)

Helium

b)

Chlorine

c)

Oxygen

d)

Neptune

22.

These metals are the most reactive.

a)

b)

c)

d)

23.

I am a nonmetal

I am in period 2

I am in group 16

a)

Ba

b)

Si

c)

O

d)

S

24.

I am a metal

I am in group 2

I am in period 6

I am…

a)

Mo

b)

Re

c)

S

d)

Ba

25.

These two elements have similar chemical properties to Barium (Ba).

a)

Ca and Ra, because they are in the same group.

b)

Cs and La, because they are in the same period number.

c)

Ca and Y, because they are 90 degree angle.

26.

What does the atomic number mean?

a)

The number of neutrons in the atom

b)

The number of electrons in the atom

c)

The number of protons in the atom

27.

Most of the chemical elements on the periodic table are

a)

Metalloids

b)

Metals

c)

Nonmetals

28.

What is a non-metal?

a)

Elements that are usually dull in appearance, and poor conductors of heat and electricity

b)

Elements that are usually shiny in appearance, and good conductors of heat and electricity

29.

What kind of charge do electrons have?

a)

Positive charge

b)

No charge

c)

Negative charge

d)

Electric charge

30.

How do you find the number of neutrons?

a)

Mass number - Atomic number

b)

Protons + Neutrons

c)

Protons + Electrons

d)

Mass number + Atomic number

31.

What element is located at group 5, period 6?

a)

Hf

b)

Ta

c)

Mo

d)

Cr

32.

What are electrons in the outermost energy level called?

a)

Valence electrons

b)

Valence protons

c)

Valence neutrons

d)

Electron cloud

33.

What has both metal and nonmetal properties?

a)

Electrons

b)

Metalloids

c)

Protons

d)

Metals

34.

If an atom has an atomic mass of 27 and an atomic number of 13, how many neutrons does it have?

a)

13

b)

15

c)

14

d)

12

35.

Where are Electrons located?

a)

In the nucleus

b)

In the electron cloud

c)

Next to the protons

36.

The number located at the top of an element is the ____.

a)

Mass number

b)

Neutrons

c)

Atomic number

d)

Symbol

37.

What are good conductors of heat?

a)

Nonmetals

b)

Metalloids

c)

Metals

38.

Who created the model that showed the electrons moved in a circular path around the nucleus?

a)

Niels Bohr

b)

Ernest Rutherford

c)

Henry Moseley

d)

Democritus

39.

What has no charge?

a)

Proton

b)

Nonmetal

c)

Neutron

d)

Electron

40.

How many electrons can the second energy level hold?

a)

2

b)

8

c)

18

d)

32

41.

Who was the first person to "think" of an atom?

a)

Democritus

b)

J.J. Thompson

c)

Rutherford

d)

Bohr

42.

What experiment was used to discover the nucleus?

a)

Cathode Ray Tube

b)

Gold Foil

c)

Chromatography

d)

Gel Electrophorese

43.

Which one of these is Dalton's Model?

a)
b)
c)
d)
44.

Who discovered the nucleus?

a)

Rutherford

b)

Bohr

c)

J.J. Thompson

d)

Democritus

45.

Who discovered electrons?

a)

Rutherford

b)

Bohr

c)

J.J. Thompson

d)

Democritus

46.

Which model was created after the discovery of electrons?

a)

Dalton's

b)

Rutherford's

c)

Quantum Mechanical Model

d)

Plum Pudding

47.

What model is the current model of the atom?

a)

Rutherford's

b)

Bohr's

c)

The Quantum Mechanical Model

d)

Dalton's

48.

How many electrons can the first energy level hold?

a)

1

b)

2

c)

8

d)

Unlimited

49.

How many electrons can the second and third (for our intents and purposes) energy levels hold?

a)

1

b)

2

c)

8

d)

Unlimited

50.

Is this the correct Bohr model for silicon (Si)?

a)

Yes

b)

No

51.

Is this the correct Bohr model for helium (He)?

a)

Yes

b)

No

52.

Is this the correct Bohr model for carbon (C)?

a)

Yes

b)

No

53.

J.J. Thomson's cathode ray experiment led to which particle being discovered?

a)

nucleus

b)

electron

c)

proton

d)

neutron

54.

Ernest Rutherford's gold-foil experiment led to which particle being discovered?

a)

crouton

b)

electron

c)

proton

d)

neutron

55.

James Chadwick's experiment led to which particle being discovered?

a)

nucleus

b)

electron

c)

proton

d)

neutron

56.

Which of the following atomic structures showed electrons in specific, fixed orbits?

a)

Dalton Model ("Billiard Ball")

b)

Thomson Model ("Plum Pudding Model")

c)

Rutherford Model

d)

Bohr Model

57.

Pictured below are two isotopes of Bromine. The "Br" refers to the ______________. 

a)

Atomic Number

b)

Mass Number

c)

Element Symbol

58.

An isotope is a variation of an element that has the same number of ______ and ______, but a different number of ______.

a)

protons; electrons; neutrons

b)

protons; neutrons; electrons

c)

electrons; neutrons; protons

59.

An element's atomic number is the total number of ______ in the nucleus of an atom.

a)

protons

b)

electrons

c)

neutrons

d)

protons and neutrons

60.

An element's mass number is the total number of ______ in the nucleus of an atom.

a)

protons

b)

electrons

c)

neutrons

d)

protons and neutrons

61.

What is a valence electron?

a)

Electrons in the first energy shell

b)

Electrons in the second energy shell

c)

Electrons in the outer shell

d)

Total number of electrons

62.
Sodium has an atomic number of 11, how many protons does this atom have?
a)
22
b)
11
c)
12
d)
2
63.
Where is the proton located?
a)
In the very dense nucleus
b)
Floating around in the negative electron cloud
c)
the loose nucleus
d)
the positive electron cloud
64.
Which description about the proton is accurate?
a)
Positively charged particle with a mass less than 0 amu
b)
A neutrally charged particle with a mass less than 0 amu
c)
Positively charged particle with a mass of 1 amu
d)
A neutrally charge particle with a mass of 1 amu
65.

How many protons are in Silicon?

a)

7

b)

42

c)

28

d)

14

66.

A neutron has what charge?

a)

Positive

b)

Negative

c)

It has no charge (it is neutral)

67.

An electron has what charge?

a)

Positive

b)

Negative

c)

It has no charge (it is neutral)

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