Wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Isotopes and Average Atomic Mass

Total questions: 24

Worksheet time: 34mins

Name
Class
Date
1.
What subatomic particles would you find in the nucleus of an atom?
a)
Protons only
b)
Protons and Neutrons
c)
Neutrons and Electrons
d)
Protons and Electrons 
2.
What subatomic particle is electrically neutral (no charge)?
a)
Proton
b)
Ion
c)
Neutron
d)
Electron
3.
Which subatomic particles contribute the most to the mass of an atom?
a)
Protons, Neutrons, Electrons
b)
Protons only
c)
Protons and Electrons
d)
Protons and Neutrons
4.
How many protons does this atom have?
a)
2.5
b)
6
c)
5
d)
10.811
5.
In order for me to find the number of neutrons, I must round the atomic mass and then do what?
a)
atomic number-atomic mass
b)
atomic number x atomic mass
c)
atomic mass + atomic number
d)
atomic mass - atomic number
6.

How many neutrons are in Magnesium?

a)

36

b)

12

c)

24

d)

6

7.

How many electrons are in Sulfur?

a)

32

b)

16

c)

48

d)

8

8.

Which would you do to change this Lithium to a new element?

a)

Add a neutron

b)

Add an electron

c)

Add a proton

d)

Add a proton and neutron\

9.

Which atom will have a +1 charge?

a)

3 protons

4 neutrons

3 electrons

b)

3 protons

4 neutrons

4 electrons

c)

3 protons

4 neutrons

2 electrons

d)

3 protons

3 neutrons

3 electrons

10.
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
a)

41.996 amu

b)

42.194 amu

c)

10.432 amu

d)

40.048 amu

11.
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
a)
41.97 amu
b)
42.19 amu
c)
10.43 amu
d)
40.04 amu
12.
Compute the average atomic mass for silicon:
a)
27.977
b)
28.09
c)
28.976
d)
The average mass cannot be determined from provided information.
13.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?
a)
32
b)
33
c)
34
d)
no way to know
14.
An element has three different isotopes. One has a mass of 35.00 amu; another has a mass of 36.00  amu; and another has a mass of 38.00  amu. What is the average atomic mass of this element?
a)
36.33 amu
b)
37.00 amu
c)
12.11 amu
d)
impossible to tell
15.
An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.
a)
51.99 amu
b)
52.19 amu
c)
53.45 amu
d)
17.33 amu
16.
Calculate the average atomic mass of silver.
a)
106.38649amu
b)
111.91896amu
c)
107.8677amu
d)
121
17.
Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208.  The average atomic mass of lead is 207.2.  Which isotope of lead is likely to be the most abundant.
a)
204
b)
206
c)
207
d)
208
18.

Calculate the average atomic mass of the element iron (Fe) using the following data:

[Isotope / % abundance]

[Iron 54 / 6% ] [Iron 56 / 92% ] [ Iron 57 / 2% ]

a)

53.7 amu

b)

54.9 amu

c)

5592.0 amu

d)

55.9 amu

19.

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

a)

Protons

b)

Neutrons

c)

Electrons

d)

Mass

20.

Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium?

a)

85.468 amu

b)

37 amu

c)

85.6 amu

d)

86.4 amu

21.

There are two primary isotopes found in any sample of copper: copper-63 and copper-65. The isotope 65Cu composes 69.2% of the sample and 63Cu comprises the other 30.8%. Based on this data, what is the atomic mass of copper?

a)

29 amu

b)

63.546 amu

c)

64.4 amu

d)

63.6 amu

22.
Atom 1 has Mass=12  Protons=6
Atom 2 has Mass= 14 Electrons=6
Are these atoms isotopes of each other or different elements?
a)
Different Elements - Mg & Si
b)
Different Elements - Ar & Ca
c)
Isotopes of Carbon
d)
Isotopes of Magnesium
23.
What is the name of the atom pictured here?
a)
Nitrogen
b)
Nitrogen-15
c)
Nitrogen-7
d)
Nitrogen-8
24.

Rubidium has two naturally occurring isotopes, 85Rb (relative mass 84.9118 amu) and 87Rb (relative mass 86.9092 amu). The abundance of 87Rb is 27.8%, If rubidium has an average atomic mass of 85.47 amu, what is the % abundance of 85Rb (in percent)?

a)

27.9%

b)

72.1%

c)

74.63%

d)

34.29%

Similar Resources on Wayground

11th.IS.IB.CHEMISTRY.STUDY GUIDE.2022

20 questions

11th.IS.IB.CHEMISTRY.STUDY GUIDE.2022

quiz

Worksheet

•

11th Grade

chemical formula

20 questions

chemical formula

quiz

Worksheet

•

10th Grade

SEC 1 LESSON 4

20 questions

SEC 1 LESSON 4

quiz

Worksheet

•

11th Grade

Classifying Matter

21 questions

Classifying Matter

quiz

Worksheet

•

7th - 9th Grade

Atomic Structure Review

20 questions

Atomic Structure Review

quiz

Worksheet

•

12th Grade

AP Chemistry Unit 7 Equilibrium

20 questions

AP Chemistry Unit 7 Equilibrium

quiz

Worksheet

•

9th - 12th Grade

Chemical misconceptions II - Ionisation energy

20 questions

Chemical misconceptions II - Ionisation energy

quiz

Worksheet

•

12th Grade

Solution Review

20 questions

Solution Review

quiz

Worksheet

•

9th Grade