WorksheetsAtoms and Molecules Review
Total questions: 22
Worksheet time: 11mins
Name
Class
Date
1.
Which number represents the atomic number of this element?
a)
12.011
b)
6
c)
3
d)
12
2.
The atomic number is also equal to the number of .....
a)
protons & neutrons
b)
neutrons & electrons
c)
protons & electrons
d)
all of the subatomic particles
3.
To find the number of neutrons in an atom you have to ....
a)
Add the protons and electrons
b)
Subtract the atomic number from the atomic mass
c)
Subtract the electrons from the protons
d)
Add the atomic number to the atomic mass
4.
Which subatomic particles are located in the electron cloud?
a)
protons
b)
neutrons
c)
electrons
d)
nucleus
5.
Which subatomic particles are located in the nucleus of an atom?
a)
electrons and neutrons
b)
protons and electrons
c)
electrons and protons
d)
protons and neutrons
6.
What is the smallest unit of all matter?
a)
atom
b)
cell
7.
What is located in the center of an atom?
a)
electron cloud
b)
valence electrons
c)
empty space
d)
nucleus
8.
A positively charged particle that is found in the nucleus of an atom is called a ....
a)
neutron
b)
electron
c)
protron
9.
A particle that is found in the nucleus that has no charge or is neutral is called a ....
a)
proton
b)
neutron
c)
electron
10.
A negatively charged particle that is located in the electron cloud of an atom is called...
a)
proton
b)
neutron
c)
electron
11.
How many electrons are in an atom of this element?
a)
28
b)
7
c)
14
d)
28.0855
12.
How many neutrons are in an atom of this element?
a)
2
b)
4
c)
4.0026
d)
1
13.
How many neutrons are in at atom of this element?
a)
3
b)
6.941
c)
4
d)
7
14.
Where is most of the mass of an atom found?
a)
In the nucleus
b)
In the electron cloud
15.
The atomic number of this pictured element is
a)
28
b)
58.6934
c)
Ni
d)
Nickel
16.
What is the atomic mass of Neon?
a)
10
b)
30
c)
10.18
d)
20.18
17.
How many protons are in this element?
a)
79
b)
196
c)
117
d)
Cannot be determined
18.
All ____________ are made up of two or more atoms bonded together.
a)
atoms
b)
molecules
c)
electrons
d)
elements
19.
2H2O
How many H2O molecules are present?
How many H2O molecules are present?
a)
1
b)
4
c)
2
d)
8
20.
What does this image represent?
a)
Atom
b)
Element
c)
Molecule
d)
Marshmallows
21.
Carbon dioxide (CO2) contains how many atoms of oxygen?
a)
0
b)
1
c)
2
d)
3
22.
What is the total number of atoms in an ammonia (NH3) molecule?
a)
1
b)
2
c)
3
d)
4
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