Free Printable Unit 1 Review

1.

Which pair represents isotopes of the same element?

a)

C-14 and N-14

b)

O-16 and O-18

c)

I-131 and Xe-131

d)

Rn-222 and Ra-222

2.

Which subatomic particles contribute significant mass to the atom?

a)

Protons only

b)

Protons and neutrons

c)

Electrons only

d)

Neutrons and electrons

3.

How many moles of K atoms are in $9.02 \times 10^{23}$ atoms?

a)

9.03 mol

b)

6.02 mol

c)

2.00 mol

d)

1.50 mol

4.

Which electron configuration represents Ti (atomic number 22)?

a)

[Ar] 4s² 3d²

b)

[Kr] 4s² 3d²

c)

[Ar] 4s² 4d²

d)

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d²

5.

A flame test gives off red light with $\lambda = 6.3 \times 10^{-7} m$ . What is the frequency of the light?

a)

$2.1 \times 10^{-15} s^{-1}$

b)

$4.8 \times 10^{14} s^{-1}$

c)

$3.0 \times 10^8 s^{-1}$

d)

$1.89 \times 10^2 s^{-1}$

6.

Which of the following statements best describes isotopes?

a)

Isotopes are different elements with the same number of protons.

b)

Isotopes are the same element with different numbers of neutrons.

c)

Isotopes are elements with the same number of electrons.

d)

Isotopes are elements with different numbers of protons and electrons.

7.

Which subatomic particles have significant mass in an atom?

a)

Only electrons

b)

Protons and neutrons

c)

Only neutrons

d)

Only protons

8.

How many moles are present in $9.02 \times 10^{23}$ atoms?

a)

0.15 mol

b)

0.90 mol

c)

1.00 mol

d)

1.50 mol

9.

Given the isotope Mg-25, how many protons, neutrons, and electrons does it have?

a)

12 protons, 12 neutrons, 13 electrons

b)

13 protons, 12 neutrons, 12 electrons

c)

12 protons, 13 neutrons, 12 electrons

d)

13 protons, 13 neutrons, 12 electrons

10.

A sample contains 12.5 g of an element with a molar mass of 24.3 g/mol. How many atoms are present in the sample?

4 lines

11.

What goes in the top left above the O in isotope notation? (a)
What goes in the bottom left under the O in isotope notation? (b)
What is the mass number? (c)
How many protons? (d)
How many neutrons? (e)

Choose from the below words

10

8

2

16

5

12.

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

13.

What do the heights of the peaks represent in the mass spectrum?

a)

number of isotopes

b)

relative abundance of each isotope

c)

average atomic mass

d)

charge:mass ratio

14.

The path of some isotopes is shown in this image. Where would the isotope with the LARGEST mass hit the detector?

A

B

C

15.

Match the following

a)

isotope

1.

element with different neutron numbers

b)

proton

2.

determines the element identity

c)

atomic mass

3.

sum of protons and neutrons

d)

electrons

4.

negative charge found in the cloud

e)

nuetrons

5.

neutral charge, # makes isotopes

16.

An atom of Aluminum-27 has:

(a) protons

(b) neutrons

a mass number of (c)

Choose from the below words

13

14

27

15

12

28

26

Unit 1 Review

Total questions: 16

Worksheet time: 15mins

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