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Review for Unit 3A

Total questions: 38

Worksheet time: 26mins

Name
Class
Date
1.

How many valence electrons are most stable for an element in a compound (except hydrogen)?

(a)  

2.

Match the following

a)

Covalent Bond

1.

Formed between two nonmetals

b)

Ionic Bond

2.

Formed between metal and nonmetal

c)

Lone Pair

3.

2 electrons not shared by atoms in a covalent compound

d)

Line

4.

How 2 bonding electrons are shown in a dot diagram

e)

Dots

5.

How lone pair electrons are shown in a dot diagram

3.

Which is the only nonmetal with 4 bonding places?

a)

Oxygen

b)

Carbon

c)

Nitrogen

d)

Hydrogen

4.

How many electrons complete the valence shell for a Hydrogen atom

(a)  

5.

How many bonds can hydrogen form?

(a)  

6.
Which of the following is the correct Lewis dot structure for the molecule fluorine (F2)?
a)
A
b)
B
c)
C
d)
D
7.

What is the correct Lewis Dot Structure for ammonia NH3

a)
b)
c)
d)
8.

N2 is an example of a

a)

Single Bond

b)

Double Bond

c)

Triple Bond

9.

Which Lewis Dot Model drawing correctly shows an O2 molecule?

a)
b)
c)
d)
10.

How many VALENCE ELECTRONS does Chlorine have?

a)

2

b)

7

c)

8

d)

10

e)

17

11.

Ionic bonds are formed when electrons get

a)

Shared between two atoms

b)

Removed from both atoms

c)

Transferred from one atom to another

d)

Added to both atoms

12.

How many valence electrons does Mg have? (use the PTable)

a)

1

b)

2

c)

3

d)

4

e)

5

13.

How many valence electrons does Po (Polonium) have? (Use your PTable)

a)

2

b)

4

c)

6

d)

8

14.

Ionic bonds typically form between

a)

A metal and a nonmetal

b)

Two nonmetals

c)

Two metals

d)

A metalloid and a metal

15.

How many VALENCE ELECTRONS does Chlorine have?

a)

2

b)

7

c)

8

d)

10

e)

17

16.

Ionic bonds are formed when electrons get

a)

Shared between two atoms

b)

Removed from both atoms

c)

Transferred from one atom to another

d)

Added to both atoms

17.

How many valence electrons does Mg have? (use the PTable)

a)

1

b)

2

c)

3

d)

4

e)

5

18.

How many valence electrons does Po (Polonium) have? (Use your PTable)

a)

2

b)

4

c)

6

d)

8

19.

Ionic bonds typically form between

a)

A metal and a nonmetal

b)

Two nonmetals

c)

Two metals

d)

A metalloid and a metal

20.

Atoms are most stable when their outer shell is complete.

a)

True

b)

False

21.

Why do elements form chemical bonds?

a)

Because they're friendly

b)

To create a new element

c)

To become stable

d)

Because they all need to gain more electrons

22.

What is the correct formula for Sodium Chloride?

a)

SCl

b)

NaCl

c)

SC

d)

NaCl2

23.

If you were to draw the lewis dot structure for Germanium (Ge), how many dots would you put around it?

a)

2

b)

4

c)

6

d)

8

24.

Write the chemical formula for K and Br (potassium bromide).

a)

KBr

b)

K2Br

c)

KBr3

d)

KBr2

25.

Write the chemical formula for Na and S (sodium sulfide).

a)

NaS

b)

S2S2

c)

Na2S

d)

NaS2

26.

Metals (like Na) typically _____ electrons in the formation of ionic bonds.

a)

Gain

b)

Lose

c)

Keep the same

27.

Nonmetals (like Cl) typically ____ electrons when they form ionic bonds.

a)

Gain

b)

Lose

c)

Keep the same

28.

Using the model for the formation of Scandium Fluoride (an ionic compound), write the chemical formula.

a)

Sc3F

b)

Sc3F3

c)

Sc+3F-1

d)

ScF3

29.

Using the model, write the chemical formula for an ionic compound that has Mg and Cl.

a)

MgCl2

b)

Mg2Cl2

c)

Mg+2Cl-1

d)

Mg2Cl2

30.
How do covalent bonds form?
a)
Donating & receiving valence e- between atoms.
b)
Opposite slight charges attract each other between compounds.
c)
Scientists are still not sure how they form.
d)
Sharing valence e- between atoms.
31.

Examine the image: How many bonds are formed looking at the model of the compound? And also indetify what type of bond is formed.

a)

2 bonds; covalent

b)

4 bonds; metallic

c)

2 bonds; ionic

d)

4 bonds; covalent

32.

Ionic Bonding is the _________ of electron/s between atoms.

a)

sharing

b)

transfer

c)

loose

d)

gain

33.

a type of covalent bond that shares two pairs of electron

a)

single bond

b)

double bond

c)

triple bond

34.

Which particle is responsible for bonding?

a)

Electrons

b)

Protons

c)

Nucleus

d)

Neutrons

35.

Why do elements bond?

a)

To be friends

b)

To create a new element

c)

To become stable

d)

To get bigger

36.
If an atom gains two electrons what charge will it have?
a)
-2
b)
-1
c)
+1
d)
+2
37.
Predict the bond that will form between Se and Cl.
a)
Ionic
b)
Covalent
38.

How many valence electrons does Oxygen (O) have?

a)

6

b)

8

c)

15

d)

16

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