Free Printable Chem Unit 1 Exam Review

1.

This is a correct dot diagram for oxygen (O)

a)

true

b)

false

2.

This is a correct dot diagram for fluorine (F)

a)

true

b)

false

3.

This is a correct dot diagram for nitrogen (N)

a)

true

b)

false

4.

This could be the dot diagram of

a)

Mg

b)

Cl

c)

C

d)

O

5.

This could be the dot diagram of

a)

O

b)

B

c)

Li

d)

Ne

6.

Which electron configuration belongs to Chlorine (Cl)?

a)

1s²2s²2p⁶3s²3p⁵

b)

1s²2s²2p⁶3s²3p⁶

c)

1s²2s²2p⁶3s²3p⁷

7.

Which element has a configuration of 1s2 2s2 2p6?

a)

Neon

b)

Helium

c)

Argon

d)

Krypton

8.

What element has the electron configuration

1s^22s^22p^3

a)

Nitrogen

b)

Oxygen

c)

Magnessium

d)

Carbon

9.

How many valence electrons are in an atom of Se?

a)

2

b)

8

c)

6

d)

5

10.

How many valence electrons are in an atom of Ba?

a)

2

b)

8

c)

4

d)

1

11.

How many valence electrons are in an atom of Ar?

a)

2

b)

8

c)

4

d)

1

12.

How many valence electrons are in an atom of In?

a)

3

b)

8

c)

4

d)

1

13.

How many valence electrons are in an atom of K?

a)

3

b)

8

c)

4

d)

1

14.

Isotopes of an element have a different number of...

a)

Protons

b)

Neutrons

c)

Electrons

d)

Mass

15.

Potassium-39 has how many neutrons?

a)

19

b)

18

c)

20

d)

21

16.

Nickel-59 has how many neutrons?

a)

30

b)

31

c)

32

d)

33

17.

Nickel-59 has how many neutrons?

a)

30

b)

31

c)

32

d)

33

18.

76 protons and 114 neutrons

a)

Osmium-114

b)

Osmium-76

c)

Osmium-190

d)

Osmium-190.23

19.

12 protons and 13 neutrons

a)

Mg-12

b)

Mg-13

c)

Mg-25

d)

Mg-24.305

20.

How do you calculate mass number?

a)

Mass x percent

b)

Protons + Electrons

c)

Protons + Neutrons

d)

Neutrons + Protons + Electrons

21.

What is the ATOMIC MASS of the isotope Carbon-14?

a)

14

b)

6

c)

12

d)

20

22.

Carbon-14 has ____ protons, ____ electrons, and _____ neutrons.

a)

6, 6, 8

b)

6, 6, 6

c)

6, 6, 14

d)

6, 10, 14

23.

Positively charged particles found in the nucleus of an atom are called

a)

protons

b)

neutrons

c)

electrons

d)

isotopes

24.

Label this atom's particles.

a)

Protons

b)

Electrons

c)

Nucleus

d)

Neutrons

1

2

3

4

1)

2)

3)

4)

25.

Label the two parts of the atom here.

a)Nucleus

b)Electron cloud

1

2

1)

2)

26.

The number of energy shells in a lithium atom are (a)

Choose from the below words

2

6

9

3

5

27.

Which isotope has 4 neutrons?

A

B

C

28.

What atom does this Bohr Model represent?

(a)

29.

What is the mass number?

a)

Number of protons plus neutrons

b)

Number of protons plus electrons

c)

Number of neutrons plus electrons

30.

An element with five valence electrons is

a)

phosphorus

b)

oxygen

c)

beryllium

d)

rubidium

31.

What's 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

32.

How many valence (outer) electrons does an Oxygen atom have?

a)

2

b)

6

c)

8

d)

16

33.

?

a)

Helium

b)

Hydrogen

c)

Argon

d)

Silver

34.

What is the atomic number of this element?

a)

17

b)

18

c)

35

d)

35.453

35.

What is the mass number of this atom of Chlorine?

a)

17

b)

18

c)

35

d)

35.453

36.

What element has 42 protons?

a)

Ca

b)

Mo

c)

Zr

d)

Po

37.

Identify the correct isotope notation:

a)

b)

c)

d)

e)

38.

How many neutrons does the isotope of lithium have?

a)

8

b)

3

c)

4

d)

5

39.

What do the peaks on the mass spectrum represent?

a)

anions

b)

different isotopes

c)

atoms with differing numbers of electrons

d)

numbers of electrons

40.

Which element does this mass spectrum most likely represent?

a)

neon

b)

scandium

c)

boron

d)

sodium

41.

What do you expect the molar mass to be for this element?

a)

91.4 g/mol

b)

90.0 g/mol

c)

4 g/mol

d)

50. g/mol

42.

Use your periodic table. There are two isotopes of rubidium: ⁸⁵Rb and ⁸⁷Rb. Which is more abundant?

a)

equally abundant

b)

rubidium-85

c)

rubidium-85.47

d)

rubidium-87

Chem Unit 1 Exam Review

Total questions: 42

Worksheet time: 47mins

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